Perhaps you should try some spelling variations:
importance network » impedance network, impededance network, importation network
important network » important work, important keyword, importation network
evidence network » science network, dence network, incidence networks
guidance network » guide network, finance network, impedance network
health evidence » health science
health guidance » health finance, health substance
systems report » system report, systems support, systems recent
health guided » health guide, hath guided, health guido

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