Perhaps you should try some spelling variations:
research documents » research arguments, research comments, research catchments
online random » engine random, line random, nonlinear random
online rand » online brand, online hand, online rapid
online band » online brand, online bin

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