Perhaps you should try some spelling variations:
"synchronised swimming" » "synchronism swimming", "synchronize swimming"
"synchronised stemming" » "synchronism stemming", "synchronize stemming", "synchronised streaming", "synchronised flemming", "synchronised stepping"
"synchronised steering" » "synchronism steering", "synchronize steering"
"synchronising stemming" » "synchronising streaming", "synchronising flemming", "synchronising stepping", "synchronizing stemming", "synchronism stemming"
"synchronisations stemming" » "synchronisations streaming", "synchronisations flemming", "synchronisations stepping", "synchronisation stemming", "synchronization stemming"
"synchronizations stemming" » "synchronizations streaming", "synchronizations flemming", "synchronizations stepping", "synchronization stemming", "synchronisation stemming", "synchronizing stemming"

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 steering"))) or ((("synchronising stemming") or ((("synchronisations stemming") OR ("synchronizations stemming"))))))))) or ("synchronized swimming"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("synchronised swimming") OR ((((("synchronised stemming") OR ("synchronised steering"))) OR ((("synchronising stemming") OR ((("synchronisations stemming") OR ("synchronizations stemming"))))))))) OR ("synchronized swimming")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"synchronised swimming\") or (((((\"synchronised stemming\") or (\"synchronised steering\"))) or (((\"synchronising stemming\") or (((\"synchronisations stemming\") OR (\"synchronizations stemming\"))))))))) or (\"synchronized swimming\"))".
• Removing quotes may allow a broader search: (((( synchronised swimming ) or ((((( synchronised stemming ) or ( synchronised steering ))) or ((( synchronising stemming ) or ((( synchronisations stemming ) OR ( synchronizations stemming ))))))))) or ( synchronized swimming )).
• Adding a wildcard symbol may retrieve word variants: (((("synchronised swimming") or ((((("synchronised stemming") or ("synchronised steering"))) or ((("synchronising stemming") or ((("synchronisations stemming") OR ("synchronizations stemming"))))))))) or ("synchronized swimming"))*.