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

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