החיפוש שביצעת - communication conversion del dimensional ((database under) OR (databases under)) - חזר ריק.

אולי כדאי לנסות איות אחר או כתיב מלא:
communication conversion » communication conversation, communications convention, communication cohesion
del dimensional » d dimensional, level dimensional, zero dimensional
conversion del » conversion _
database under » database user, database index, database order

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