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

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