אולי כדאי לנסות איות אחר או כתיב מלא:
communication document » communication content, communication student, communication current
units dimensions » finite dimensions, its dimension, rims dimensions
document units » document united, documents unit, document using
state ddspaces » state spaces, state space, staged spaces
type ddspaces » type spaces, type spares
ddspaces » dddspaces
space » dspace

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• Performing a fuzzy search may retrieve terms with similar spellings: communication document units dimensions ((((type ddspaces) or (shape space))) or (state ddspaces))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: communication document units dimensions ((((type ddspaces) OR (shape space))) OR (state ddspaces)).
• Adding a wildcard symbol may retrieve word variants: communication document units dimensions ((((type ddspaces) or (shape space))) or (state ddspaces))*.