Talvez debería tentar con algunhas variantes ortográficas:
communication model » communication models, communication modul, communication moral
communication mass » communication models, communication making, communication media
discussion started » discussion chapter, discussion part, discussion based
started five » started guide, started food, started from

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• Performing a fuzzy search may retrieve terms with similar spellings: communication ((communication model) or (communication mass)) discussion started five~.
• If you are trying to use Boolean operators, they must be ALL CAPS: communication ((communication model) OR (communication mass)) discussion started five.
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