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

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 ("synchronism stemming"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"synchronised swimming\") OR (((\"synchronising stemming\") OR (\"synchronism stemming\"))))".
• Removing quotes may allow a broader search: (( synchronised swimming ) OR ((( synchronising stemming ) OR ( synchronism stemming )))).
• Adding a wildcard symbol may retrieve word variants: (("synchronised swimming") OR ((("synchronising stemming") OR ("synchronism stemming"))))*.