Convert to Searchable PDF (File menu)
Use this command to convert image-only scanned PDFs to a PDF with searchable text. Unlike the other conversion functions, this command does not produce any output files. Instead it is designed to modify the opened document, adding an invisible text layer over scanned pages that allow for searching for text patterns.
With your scanned PDF opened in Able2Extract Professional, go into the File menu and click on Convert to Searchable PDF.
Once the process is done, go to Edit > Search Text... (CTRL+ F) or click on the command on the toolbar. In the Search dialog that appears, perform your search as usual by typing in the terms you would like to find within your scanned PDF document.