Perhaps you should try some spelling variations:
innovation sources » information sources, innovation surveys, innovation policies
social innovation » social isolation, social integration, social interaction
gas transmission » _ transmission, hiv transmission
nepal social » senegal social, local social
a gas » _ gas, a gis

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( nepal social innovation sources ) or ( a gas transmission (lines OR line) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( nepal social innovation sources ) OR ( a gas transmission (lines OR line) )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( nepal social innovation sources ) or ( a gas transmission (lines OR line) ))".
• Adding a wildcard symbol may retrieve word variants: (( nepal social innovation sources ) or ( a gas transmission (lines OR line) ))*.