Perhaps you should try some spelling variations:
instruction comprehensive » introduction comprehensive, introduction comprehension, constructive comprehension
comprehensive programming » comprehensive program, comprehensive programs, comprehension programmed
extension concepts » expansion concepts, regression concepts, extension conduct
sensor concepts » sensor concept, tensor concepts, sensors concept

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 ((sensor concepts) or (extension concepts)) cited~.
• If you are trying to use Boolean operators, they must be ALL CAPS: instruction comprehensive programming ((sensor concepts) OR (extension concepts)) cited.
• Adding a wildcard symbol may retrieve word variants: instruction comprehensive programming ((sensor concepts) or (extension concepts)) cited*.