Perhaps you should try some spelling variations:
information depreciation » information representation, information dissemination, information aggregation
information propagation » information presentation, information organization
problems extension » problems session, problem extending, problems extended
extension concepts » expansion concepts, regression concepts, extension conduct
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: ((information depreciation) or (information propagation)) problems extension concepts case~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((information depreciation) OR (information propagation)) problems extension concepts case.
• Adding a wildcard symbol may retrieve word variants: ((information depreciation) or (information propagation)) problems extension concepts case*.