Perhaps you should try some spelling variations:
health impedance » health importance, health temperance, head impedance
health science » health sciences
nets synthesis » net synthesis, dots synthesis, its synthesis
science nets » science news, science sets, science netsci

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