Perhaps you should try some spelling variations:
communication aggression » communication apprehension, communication addresses, communication cohesion
databases optimising » database optimising, databases optimization, databases mining
databases optimizing » catalysis optimizing, analysis optimizing, databases mining
all dimensional » a dimensional, all dimensions, any dimensional
aggression all » aggression a, regression all, aggression self

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

• Performing a fuzzy search may retrieve terms with similar spellings: communication aggression all dimensional ((databases optimising) or (databases optimizing))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: communication aggression all dimensional ((databases optimising) OR (databases optimizing)).
• Adding a wildcard symbol may retrieve word variants: communication aggression all dimensional ((databases optimising) or (databases optimizing))*.