Perhaps you should try some spelling variations:
"social network" » "social networks", "social netyork"
"social works" » "social work's", "social workers", "social worlds", "social yorks"
"social worka" » "social worker", "social work's", "social workup", "social yorka"
"social work" » "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 works") OR ("social work"))) OR ("social worka")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"social network\") or (((((\"social works\") OR (\"social work\"))) or (\"social worka\"))))".
• Removing quotes may allow a broader search: (( social network ) or ((((( social works ) OR ( social work ))) or ( social worka )))).
• Adding a wildcard symbol may retrieve word variants: (("social network") or ((((("social works") OR ("social work"))) or ("social worka"))))*.