Perhaps you should try some spelling variations:
research comments » research commons, research contents, research commentary
ranked search » range search, based search, random search
rand research » brand research, range research, card research
online rand » online brand, online band, online hand
rand search » random 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 search) OR (ranked search)) document ) OR ( online rand research comments ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( online ((rand search) OR (ranked search)) document ) or ( online rand research comments ))*".