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

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