Perhaps you should try some spelling variations:
substance network » distance network, substrate network, resistance network
systems support » system support, systems supporting, system supporting
health science » health sciences

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