תוצאות חיפוש - ((((seed control) or (pid controller))) or (weeds control))

החיפוש שביצעת - ((((seed control) or (pid controller))) or (weeds control)) - חזר ריק.

אולי כדאי לנסות איות אחר או כתיב מלא:
pid controller » logic controller
seed control » speed control , weed control , shared control

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Performing a fuzzy search may retrieve terms with similar spellings: ((((seed control) or (pid controller))) or (weeds control))~.
If you are trying to use Boolean operators, they must be ALL CAPS: ((((seed control) OR (pid controller))) OR (weeds control)).
Adding a wildcard symbol may retrieve word variants: ((((seed control) or (pid controller))) or (weeds control))*.