Perhaps you should try some spelling variations:
programming mathematical » programming mathematics, processing mathematical, planning mathematical
functions conditional » functions functional, functional conditioning, functions computational
programming recursion » programming decision, programming session, programming decisions
assays virus » arrays virus, assays drug

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "functions conditional ((programming mathematical) OR (programming recursion)) assays virus~".
• Adding a wildcard symbol may retrieve word variants: functions conditional ((programming mathematical) OR (programming recursion)) assays virus*.