Perhaps you should try some spelling variations:
edrf synthesis » wdf synthesis, f synthesis, paf synthesis
science risks » science risk, science rise, science ross
science tasks » science tools, science track, science teams
health guided » health guide, hath guided, health guido
guided edrf » guided edit, guided edits, guided entry

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 ((science risks) OR (science tasks)) synthesis report ) OR ( health guided edrf synthesis report ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( health ((science risks) OR (science tasks)) synthesis report ) or ( health guided edrf synthesis report ))*".