Perhaps you should try some spelling variations:
introduction comprehensive » introduction comparative
comprehensive programme » comprehensive program, comprehensive programs, comprehensive programming
tension concepts » extension concepts, tensor concepts, revision concepts
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: introduction comprehensive programme ((tension concepts) or (sensor concepts)) cited~.
• If you are trying to use Boolean operators, they must be ALL CAPS: introduction comprehensive programme ((tension concepts) OR (sensor concepts)) cited.
• Adding a wildcard symbol may retrieve word variants: introduction comprehensive programme ((tension concepts) or (sensor concepts)) cited*.