I use the free versions of two programs to store the recipes which DOES allow searching a folder/subfolders for multiple keywords (ingredients).
Bullzip offers a PDF printer which is installed an another printer option. Anything printable can be turned into a PDF file.
FREE PDF Printer
I use the free version of PDF-XChange Editor as my default PDF viewer.
Tracker Software Products :: Product
"The FREE download of the PDF-XChange Editor may be used without limitation for Private, Commercial, Government and all uses, provided it is not: incorporated or distributed for profit/commercial gain with other software or media distribution of any type - without first gaining permission."
The paid version offers a few added capabilities, but unnecessary for this project.
Once the document is open in PDF XChange Editor, use the program's built-in OCR function to create a new copy. I personally choose to overwrite the first file with the newer OCR'd file.
Using the program's Search function, I can search the designated folder and subfolders for multiple ingredients.
Without going into detail, there are only a few internal settings required telling it how / where to search.
Should anyone be interested, I'll be glad to help.
Also, using the CamScanner app for my phone, it is possible to create PDF images which can be made searchable.
I am not advocating violating copyright law.