Perhaps you should try some spelling variations:
"social network" » "social networks", "social netyork"
"social worksa" » "social worka", "social work's", "social workup", "social workssa", "social yorksa"
"social worker" » "social workers", "social world", "social market", "social workser", "social yorker"
"social work" » "social works", "social york"

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("social network") OR ("social work"))) OR ((("social worksa") OR ("social worker")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"social network\") or (\"social work\"))) or (((\"social worksa\") OR (\"social worker\"))))".
• Removing quotes may allow a broader search: (((( social network ) or ( social work ))) or ((( social worksa ) OR ( social worker )))).
• Adding a wildcard symbol may retrieve word variants: (((("social network") or ("social work"))) or ((("social worksa") OR ("social worker"))))*.