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

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