Perhaps you should try some spelling variations:
communication cohesion » communication collections, communication control, communication cost
databases optimizing » catalysis optimizing, analysis optimizing, databases mining
databases limited » database limited, databases united, databases invited
two dimensional » three dimensional
cohesion two » cohesion _, cohesion a, cohesion eli

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 two dimensional ((databases limited) or (databases optimizing))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: communication cohesion two dimensional ((databases limited) OR (databases optimizing)).
• Adding a wildcard symbol may retrieve word variants: communication cohesion two dimensional ((databases limited) or (databases optimizing))*.