Perhaps you should try some spelling variations:
"synchronism swimming" » "synchronising swimming", "synchronized swimming"
"synchronize swimming" » "synchronized swimming", "synchronizing swimming"
"synchronised stemming" » "synchronized stemming", "synchronising stemming", "synchronised steering", "synchronised stepping", "synchronised stealing"
"synchronised flemming" » "synchronized flemming", "synchronising flemming", "synchronised fleming"
"synchronised streaming" » "synchronized streaming", "synchronising streaming"
"synchronised treating" » "synchronized 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: (((("synchronism swimming") or ("synchronize swimming"))) or ((((("synchronised stemming") or ("synchronised flemming"))) or ((("synchronised streaming") or ("synchronised treating"))))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("synchronism swimming") OR ("synchronize swimming"))) OR ((((("synchronised stemming") OR ("synchronised flemming"))) OR ((("synchronised streaming") OR ("synchronised treating")))))).
• Removing quotes may allow a broader search: (((( synchronism swimming ) or ( synchronize swimming ))) or ((((( synchronised stemming ) or ( synchronised flemming ))) or ((( synchronised streaming ) or ( synchronised treating )))))).
• Adding a wildcard symbol may retrieve word variants: (((("synchronism swimming") or ("synchronize swimming"))) or ((((("synchronised stemming") or ("synchronised flemming"))) or ((("synchronised streaming") or ("synchronised treating"))))))*.