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

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