Perhaps you should try some spelling variations:
"online line research documents" » "onlife life research documents", "onlike like research documents", "onlive live research documents", "online line research document"
"online chapter5 research students" » "onlife chapter5 research students", "onlike chapter5 research students", "onlive chapter5 research students"

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 line research documents") OR ("online chapter5 research students"))*.
• Removing quotes may allow a broader search: (( online line research documents ) or ( online chapter5 research students ))*.