Perhaps you should try some spelling variations:
"online ring research contents" » "online ring research content", "online ring research context", "online ring research concepts", "online caring research contents", "online curing research contents", "online doing research contents", "online during research contents", "online rating research contents", "online racing research contents"
"online hiring research contents" » "online hiring research content", "online hiring research context", "online hiring research concepts", "online sharing research contents", "online hearing research contents", "online aiming research contents", "online hicaring research contents", "online hicuring research contents", "online hidoing research contents", "online hitting research contents", "online during research contents"
"online random search documents" » "online random search document", "online random research documents", "online random searching documents", "engine random search documents", "line random search documents", "nonlinear random search documents"

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 random search documents") OR ((("online ring research contents") OR ("online hiring research contents"))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"online random search documents\") or (((\"online ring research contents\") OR (\"online hiring research contents\"))))*".
• Removing quotes may allow a broader search: (( online random search documents ) or ((( online ring research contents ) OR ( online hiring research contents ))))*.