Perhaps you should try some spelling variations:
conjoint surveys » online surveys, point surveys, joint survey
confirm surveys » firm surveys
harvard second » harvard cold
content survey » contexts survey, content server, content sources
second urban » beyond urban, second great, second bank

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: harvard second urban studies ((confirm surveys) OR (((conjoint surveys) OR (content survey)))).~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "harvard second urban studies ((confirm surveys) or (((conjoint surveys) OR (content survey)))).~".
• Adding a wildcard symbol may retrieve word variants: harvard second urban studies ((confirm surveys) or (((conjoint surveys) OR (content survey)))).*.