Perhaps you should try some spelling variations:
"synchronism swimming" » "synchronize swimming", "synchronising swimming"
"synchronised stemming" » "synchronize stemming", "synchronising stemming", "synchronised streaming", "synchronised steering", "synchronised stealing"
"synchronised stepping" » "synchronize stepping", "synchronising stepping", "synchronised stopping", "synchronised shopping", "synchronised shipping"
"synchronised flemming" » "synchronize flemming", "synchronising 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 ("synchronized swimming"))) or ((((("synchronised stemming") OR ("synchronised stepping"))) or ("synchronised flemming"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("synchronism swimming") OR ("synchronized swimming"))) OR ((((("synchronised stemming") OR ("synchronised stepping"))) OR ("synchronised flemming")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"synchronism swimming\") or (\"synchronized swimming\"))) or (((((\"synchronised stemming\") OR (\"synchronised stepping\"))) or (\"synchronised flemming\"))))".
• Removing quotes may allow a broader search: (((( synchronism swimming ) or ( synchronized swimming ))) or ((((( synchronised stemming ) OR ( synchronised stepping ))) or ( synchronised flemming )))).
• Adding a wildcard symbol may retrieve word variants: (((("synchronism swimming") or ("synchronized swimming"))) or ((((("synchronised stemming") OR ("synchronised stepping"))) or ("synchronised flemming"))))*.