Perhaps you should try some spelling variations:
"social network" » "social networks", "social netyork"
"social work" » "social works", "social york"
"social networks" » "social networkss", "social netyorks"
"social workers" » "social worksers", "social yorkers"

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 networks") OR ("social workers")))).
• Removing quotes may allow a broader search: (((( social network ) or ( social work ))) or ((( social networks ) or ( social workers )))).
• Adding a wildcard symbol may retrieve word variants: (((("social network") or ("social work"))) or ((("social networks") or ("social workers"))))*.