Recuva - user help

I installed Recuva without any errors. I created a test file called abc.txt. I deleted the file and then emptied the waste basket. I then did a search for file abc.txt. In the Find text box I entered the name of the file. Recuva did not find the file. It provided a lot of other files. Not just files starting with the letter A. I tried again and gave it the path to the file. I got the same results. Help!!