Perhaps you should try some spelling variations:
functions computational » functions computation, function computation, directions computational
introduction reading » introductory readings, introduction building, introduction review
using classes » reusing classes, using classemes, using molasses
classes virus » classes irks, measles virus, classes via

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((functions computational) OR (introduction reading)) programming using classes virus~.
• Adding a wildcard symbol may retrieve word variants: ((functions computational) or (introduction reading)) programming using classes virus*.