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