Perhaps you should try some spelling variations:
research contents » research content, research context, research concepts
rand research » brand research, range research, ad research
card research » care research, based research
hand research » land research, sand research, brand research
online hand » online band, online handel, online brand
rand search » ranked search, range search, trend search

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 ((rand research) OR (card research)) arguments ) OR ( online hand research contents ))) OR ( online ((rand search) OR (random search)) document )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((( online ((rand research) OR (card research)) arguments ) or ( online hand research contents ))) or ( online ((rand search) or (random search)) document ))".
• Adding a wildcard symbol may retrieve word variants: (((( online ((rand research) OR (card research)) arguments ) or ( online hand research contents ))) or ( online ((rand search) or (random search)) document ))*.