No tables found after running Expdp and Impdp in Oracle 12c
I couldn't find what went wrong in your procedure and reproduce the same scenario either. I can help by demonstrating how to export one schema to another or in to the same database. I created the following example for this purpose.

Disclaimer: I don't have 12c instance to test it right now, but same procedure should work for 12c as well.

SQL&gt; create user myschema identified by myschema;

User created.

SQL&gt; grant connect, resource to myschema;

Grant succeeded.

SQL&gt; conn myschema/myschema
Connected.
SQL&gt; create table product(id number, name varchar2(20));

Table created.

SQL&gt; insert into product values(1, 'sample_product_name');

1 row created.

SQL&gt; commit;

Commit complete.

SQL&gt; create directory dp_dir as '/home/oracle/Desktop';

Directory created.

SQL&gt; exit 
Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, Automatic Storage Management, OLAP, Data Mining
and Real Application Testing options
[oracle@nepal Desktop]$ clear

[oracle@nepal Desktop]$ expdp system/oracle schemas=myschema directory=dp_dir dumpfile=expdp_myschema.dmp logfile=expdp_myschema.log

Export: Release 11.2.0.4.0 - Production on Sat Jul 30 07:02:07 2016

Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.

Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, Automatic Storage Management, OLAP, Data Mining
and Real Application Testing options
Starting "SYSTEM"."SYS_EXPORT_SCHEMA_01":  system/password schemas=myschema directory=dp_dir dumpfile=expdp_myschema.dmp logfile=expdp_myschema.log 
Estimate in progress using BLOCKS method...
Processing object type SCHEMA_EXPORT/TABLE/TABLE_DATA
Total estimation using BLOCKS method: 64 KB
Processing object type SCHEMA_EXPORT/USER
Processing object type SCHEMA_EXPORT/SYSTEM_GRANT
Processing object type SCHEMA_EXPORT/ROLE_GRANT
Processing object type SCHEMA_EXPORT/DEFAULT_ROLE
Processing object type SCHEMA_EXPORT/PRE_SCHEMA/PROCACT_SCHEMA
Processing object type SCHEMA_EXPORT/TABLE/TABLE
. . exported "MYSCHEMA"."PRODUCT"                        5.429 KB       1 rows
Master table "SYSTEM"."SYS_EXPORT_SCHEMA_01" successfully loaded/unloaded
******************************************************************************
Dump file set for SYSTEM.SYS_EXPORT_SCHEMA_01 is:
  /home/oracle/Desktop/expdp_myschema.dmp
Job "SYSTEM"."SYS_EXPORT_SCHEMA_01" successfully completed at Sat Jul 30 07:04:51 2016 elapsed 0 00:02:21

[oracle@nepal Desktop]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.4.0 Production on Sat Jul 30 07:10:06 2016

Copyright (c) 1982, 2013, Oracle.  All rights reserved.


Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, Automatic Storage Management, OLAP, Data Mining
and Real Application Testing options

SQL&gt; drop user myschema cascade;

User dropped.

SQL&gt; exit
Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, Automatic Storage Management, OLAP, Data Mining
and Real Application Testing options


   [oracle@nepal Desktop]$ impdp system/oracle schemas=myschema directory=dp_dir dumpfile=expdp_myschema.dmp

Import: Release 11.2.0.4.0 - Production on Sat Jul 30 07:11:44 2016

Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.

Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, Automatic Storage Management, OLAP, Data Mining
and Real Application Testing options
Master table "SYSTEM"."SYS_IMPORT_SCHEMA_01" successfully loaded/unloaded
Starting "SYSTEM"."SYS_IMPORT_SCHEMA_01":  system/password schemas=myschema directory=dp_dir dumpfile=expdp_myschema.dmp 
Processing object type SCHEMA_EXPORT/USER
Processing object type SCHEMA_EXPORT/SYSTEM_GRANT
Processing object type SCHEMA_EXPORT/ROLE_GRANT
Processing object type SCHEMA_EXPORT/DEFAULT_ROLE
Processing object type SCHEMA_EXPORT/PRE_SCHEMA/PROCACT_SCHEMA
Processing object type SCHEMA_EXPORT/TABLE/TABLE
Processing object type SCHEMA_EXPORT/TABLE/TABLE_DATA
. . imported "MYSCHEMA"."PRODUCT"                        5.429 KB       1 rows
Job "SYSTEM"."SYS_IMPORT_SCHEMA_01" successfully completed at Sat Jul 30 07:12:14 2016 elapsed 0 00:00:19

[oracle@nepal Desktop]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.4.0 Production on Sat Jul 30 07:13:08 2016

Copyright (c) 1982, 2013, Oracle.  All rights reserved.


Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, Automatic Storage Management, OLAP, Data Mining
and Real Application Testing options

SQL&gt; conn myschema/myschema
Connected.

SQL&gt; select table_name from tabs;

TABLE_NAME
------------------------------
PRODUCT

SQL&gt; select * from product;

    ID NAME
---------- --------------------
     1 sample_product_name

SQL&gt;