Perhaps you should try some spelling variations:
research documents » research arguments, research comments, research catchments
card research » care research, based research
online card » online car, online care, online case
online rand » online brand, online band, online hand
rand search » random search, ranked search, rand research

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: (( online card research documents ) OR ( online rand search document )).
• Adding a wildcard symbol may retrieve word variants: (( online card research documents ) or ( online rand search document ))*.