Perhaps you should try some spelling variations:
communication cohesion » communication collections, communication control, communication cost
recursion removal » occlusion removal, region removal, turion removal
disks extracting » disk extraction, lines extracting, task extracting
bulk extraction » fluid extraction, field extraction

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

• Performing a fuzzy search may retrieve terms with similar spellings: communication cohesion ((disks extracting) or (bulk extraction)) recursion removal~.
• If you are trying to use Boolean operators, they must be ALL CAPS: communication cohesion ((disks extracting) OR (bulk extraction)) recursion removal.
• Adding a wildcard symbol may retrieve word variants: communication cohesion ((disks extracting) or (bulk extraction)) recursion removal*.