Perhaps you should try some spelling variations:
information sources » information resources, information services, information security
social information » social innovation, social transformation, digital information
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 information sources ) or ( a gas transmission (lines or line) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( nepal social information sources ) OR ( a gas transmission (lines OR line) )).
• Adding a wildcard symbol may retrieve word variants: (( nepal social information sources ) or ( a gas transmission (lines or line) ))*.