Perhaps you should try some spelling variations:
communication adhesion » communication cohesion, communication aggression, communication affection
database optimising » databases optimizing, data optimising, database optimized
scale directional » scale bidirectional, local directional, dual directional
all directional » a directional, le directional, dual directional

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

• Performing a fuzzy search may retrieve terms with similar spellings: communication adhesion ((all directional) OR (scale directional)) database optimising~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "communication adhesion ((all directional) OR (scale directional)) database optimising".
• Adding a wildcard symbol may retrieve word variants: communication adhesion ((all directional) OR (scale directional)) database optimising*.