Perhaps you should try some spelling variations:
interaction sources » international sources, information sources
social interaction » social interactions, social integration
data transmission » gas transmission, _ transmission, hiv transmission
essential social » essential oils, essential skills
lines » line

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( essential social interaction sources ) or ( _ data transmission lines ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( essential social interaction sources ) OR ( _ data transmission lines )).
• Adding a wildcard symbol may retrieve word variants: (( essential social interaction sources ) or ( _ data transmission lines ))*.