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 flemming", "synchronised stepping", "synchronised stealing"
"synchronised streaming" » "synchronized streaming", "synchronising streaming", "synchronised treating"
"synchronised steering" » "synchronized steering", "synchronising steering"

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