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