Perhaps you should try some spelling variations:
communications convention » communications connections, communication connection, communication conversation
convention offset » convention fort, convention wise, convention after
offset estimation » effort estimation, robust estimation, cost estimation
euclidean rings » euclidean minisum, euclidean graphs, euclidean random
euclidean gibbs » euclidean graphs, euclidean logics

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• Performing a fuzzy search may retrieve terms with similar spellings: communications convention offset estimation ((euclidean rings) or (euclidean gibbs))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: communications convention offset estimation ((euclidean rings) OR (euclidean gibbs)).
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