Perhaps you should try some spelling variations:
instruction comprehensive » introduction comprehensive, introduction comprehension, constructive comprehension
programming reactors » programming factors, programming reaction, programming reactive
programming errors » programming effort, programming entropy, programming factors
concept car » concept a

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

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