Perhaps you should try some spelling variations:
"synchronised swimming" » "synchronism swimming", "synchronize swimming", "synchronising swimming"
"synchronised stemming" » "synchronism stemming", "synchronize stemming", "synchronising stemming", "synchronised steering", "synchronised flemming", "synchronised stepping"
"synchronised streaming" » "synchronism streaming", "synchronize streaming", "synchronising streaming"
"synchronised treating" » "synchronism treating", "synchronize treating", "synchronising treating", "synchronised creating", "synchronised heating", "synchronised relating"

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