Perhaps you should try some spelling variations:
"online large research contents" » "online large research content", "online large research context", "online large research concepts", "online care research contents", "online change research contents", "online edge research contents", "online target research contents", "nine large research contents", "online merge 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 large research contents"))*.
• Removing quotes may allow a broader search: (( online random search documents ) or ( online large research contents ))*.