Perhaps you should try some spelling variations:
health guidance » health finance, health substance
health science » health sciences
work synthesis » world synthesis, walk synthesis, shock synthesis
science work » science works, science world, science where

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: (((( health evidence ((network synthesis) OR (network systems)) report ) OR ( health science work synthesis report ))) OR ( health guidance ((network synthesis) OR (network systems)) report )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((( health evidence ((network synthesis) OR (network systems)) report ) or ( health science work synthesis report ))) or ( health guidance ((network synthesis) OR (network systems)) report ))".
• Adding a wildcard symbol may retrieve word variants: (((( health evidence ((network synthesis) OR (network systems)) report ) or ( health science work synthesis report ))) or ( health guidance ((network synthesis) OR (network systems)) report ))*.