Perhaps you should try some spelling variations:
"synchronize swimming" » "synchronized swimming", "synchronizing swimming"
"synchronised stemming" » "synchronized stemming", "synchronising stemming", "synchronised streaming", "synchronised steering", "synchronised stealing"
"synchronised flemming" » "synchronized flemming", "synchronising flemming", "synchronised fleming"
"synchronism stepping" » "synchronising stepping", "synchronized stepping", "synchronism stopping", "synchronism shopping", "synchronism shipping"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("synchronize swimming") OR ((((("synchronised stemming") OR ("synchronised flemming"))) OR ("synchronism stepping"))))~.
• Removing quotes may allow a broader search: (( synchronize swimming ) or ((((( synchronised stemming ) or ( synchronised flemming ))) or ( synchronism stepping ))))~.
• Adding a wildcard symbol may retrieve word variants: (("synchronize swimming") or ((((("synchronised stemming") or ("synchronised flemming"))) or ("synchronism stepping"))))*.