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

You may be able to get more results by adjusting your search query.

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