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

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• Performing a fuzzy search may retrieve terms with similar spellings: information documentation protocol definitions ((causes libris) OR (causes citrus))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "information documentation protocol definitions ((causes libris) OR (causes citrus))".
• Adding a wildcard symbol may retrieve word variants: information documentation protocol definitions ((causes libris) OR (causes citrus))*.