Perhaps you should try some spelling variations:
development psychological » unemployment psychological, environment psychological, development biological
development technological » development technologies, development technology, development technical

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((development psychological) OR (development technological))".
• Adding a wildcard symbol may retrieve word variants: ((development psychological) OR (development technological))*.