Perhaps you should try some spelling variations:
computation bioinformatics » computational bioinformatics, computing bioinformatics, comparative bioinformatics
database optimising » databases optimizing, data optimising, database optimized
https directional » wimps directional, aids directional, two directional
database assisted » database system, data assisted, database limited

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

• If you are trying to use Boolean operators, they must be ALL CAPS: computation bioinformatics https directional ((database optimising) OR (database assisted))~.
• Adding a wildcard symbol may retrieve word variants: computation bioinformatics https directional ((database optimising) or (database assisted))*.