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