Perhaps you should try some spelling variations:
"synchronised swimming" » "synchronized swimming", "synchronising swimming"
"synchronised stemming" » "synchronized stemming", "synchronising stemming", "synchronised streaming", "synchronised steering", "synchronised stealing"
"synchronised stepping" » "synchronized stepping", "synchronising stepping", "synchronised stopping", "synchronised shopping", "synchronised shipping"
"synchronism stemming" » "synchronism streaming", "synchronism steering", "synchronism stealing", "synchronising stemming", "synchronized stemming"
"synchronize flemming" » "synchronized flemming", "synchronizing flemming", "synchronize fleming"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("synchronised swimming") or ((((((("synchronised stemming") OR ("synchronised stepping"))) or ("synchronize flemming"))) or ("synchronism stemming"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("synchronised swimming") OR ((((((("synchronised stemming") OR ("synchronised stepping"))) OR ("synchronize flemming"))) OR ("synchronism stemming")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"synchronised swimming\") or (((((((\"synchronised stemming\") OR (\"synchronised stepping\"))) or (\"synchronize flemming\"))) or (\"synchronism stemming\"))))".
• Removing quotes may allow a broader search: (( synchronised swimming ) or ((((((( synchronised stemming ) OR ( synchronised stepping ))) or ( synchronize flemming ))) or ( synchronism stemming )))).
• Adding a wildcard symbol may retrieve word variants: (("synchronised swimming") or ((((((("synchronised stemming") OR ("synchronised stepping"))) or ("synchronize flemming"))) or ("synchronism stemming"))))*.