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