Perhaps you should try some spelling variations:
research documents » research arguments, research comments, research catchments
card research » care research, based research
case research » care research, use research, change research
online card » online car, online care, online call
online case » online class, online classes
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 case research documents ))) OR ( online rand search document )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((( online card research documents ) OR ( online case research documents ))) or ( online rand search document ))".
• Adding a wildcard symbol may retrieve word variants: (((( online card research documents ) OR ( online case research documents ))) or ( online rand search document ))*.