Create Custom Search and result page
Installing module or modifying .tpl files are not required to get a simple search page.

Creating a view and using Exposed Filters setting will get the job done.

Providing you high level steps below, you may need to research a bit more to accomplish this task.

Steps


Create a View. 
Choose "Table" in Format section.
Add "Certificate Name ,Certificate Number,Certificate,Issuing Date,Date of Expiry" in field section.
In filter criteria, select your content type.
Also add "Company name, Certificate number" in the Filter Criteria. 
Click Advanced > Better Exposed Forms > Better Exposed Filters.

Expose the fields "Company name &amp; Certification number" as text fields.
You can expose this fields as a Drupal Block and assign it anywhere in the page.