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

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