terminal search files by text that the file names contain
sudo find / -type f -name "*deh*"


if you want to search directories too then remove the -type f.  You can also try:
    sudo locate deh

Should your locate database not be created (or up to date), there is a chance you have that file on the filesystem, but it's not been stored yet. Rather than run a single find command above, building the locate.db database might be a better plan going forward.