Perhaps you should try some spelling variations:
introduction conventional » introduction international, introduction conceptual, introduction regional
programming decision » programming decisions, programming recursion, programming session
programming design » program design
assays virus » arrays virus, assays drug

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

• Performing a fuzzy search may retrieve terms with similar spellings: introduction conventional ((programming decision) or (programming design)) assays virus~.
• If you are trying to use Boolean operators, they must be ALL CAPS: introduction conventional ((programming decision) OR (programming design)) assays virus.
• Adding a wildcard symbol may retrieve word variants: introduction conventional ((programming decision) or (programming design)) assays virus*.