Perhaps you should try some spelling variations:
"synchronised swimming" » "synchronized swimming"
"synchronised stemming" » "synchronized stemming", "synchronised streaming", "synchronised steering", "synchronised stepping"
"synchronism swimming" » "synchronized swimming"
"synchronize swimming" » "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 ("synchronised stemming"))) 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 ("synchronised stemming"))) 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 (\"synchronised stemming\"))) or (((\"synchronism swimming\") or (\"synchronize swimming\"))))) or (\"synchronising flemming\"))".
• Removing quotes may allow a broader search: (((((( synchronised swimming ) OR ( synchronised stemming ))) or ((( synchronism swimming ) or ( synchronize swimming ))))) or ( synchronising flemming )).
• Adding a wildcard symbol may retrieve word variants: (((((("synchronised swimming") OR ("synchronised stemming"))) or ((("synchronism swimming") or ("synchronize swimming"))))) or ("synchronising flemming"))*.