Perhaps you should try some spelling variations:
introduction comprehensive » introduction comparative
programming tutorial » programming tutorials, programming social, programming theories
programming sensor » programming session, programming sno2, programming support
concepts case » concepts cases, concepts a, concepts chapter

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

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