Perhaps you should try some spelling variations:
information documentation » international documentation, information presentation, information documents
documentation protocol » documentation projects, documentation control, documentation problems
protocol functions » protocol functional, protocol foundation, protein functions
causes citrus » causing citrus, causes cures, assess citrus

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

• Performing a fuzzy search may retrieve terms with similar spellings: information documentation protocol functions ((causes libris) or (causes citrus))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: information documentation protocol functions ((causes libris) OR (causes citrus)).
• Adding a wildcard symbol may retrieve word variants: information documentation protocol functions ((causes libris) or (causes citrus))*.