Perhaps you should try some spelling variations:
communication fermentation » communication representation, communication documentation, communication presentation
systems specification » system specification, systems verification, systems identification
fermentation systems » representation systems, argumentation systems, documentation systems
database invited » databases invited, databases united, database limited

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

• Performing a fuzzy search may retrieve terms with similar spellings: communication fermentation systems specification ((database invited) or (databases bncod))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: communication fermentation systems specification ((database invited) OR (databases bncod)).
• Adding a wildcard symbol may retrieve word variants: communication fermentation systems specification ((database invited) or (databases bncod))*.