Perhaps you should try some spelling variations:
health impedance » health importance, health temperance, head impedance
systems report » system report, systems support, systems recent
science nets » science news, science netsci, science meets
science sets » science set, science meets, science sears
network » networks

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