החיפוש שביצעת - communications convention users ((dimensioning database) OR (dimensions database)) under - חזר ריק.

אולי כדאי לנסות איות אחר או כתיב מלא:
communications convention » communications connections, communication connection, communication conversation
dimensioning database » dimensional database, dimensional databases, dimensioning details
dimensions database » dimensional database, dimensional databases, decisions database
convention users » convention des, convention using, conversion user

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