Perhaps you should try some spelling variations:
"online link research comments" » "online link research commons", "online link research contents", "online link research commentary", "online line research comments", "online linked research comments", "online liner research comments", "online linux research comments", "online think research comments", "online eine research comments"
"online chapter6 research study" » "online chapter1 research study", "online chapter5 research study", "online chapter7 search study", "online chapter research study", "online chapters research study", "online chapter9 research study"

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 link research comments") OR ("online chapter6 research study"))*.
• Removing quotes may allow a broader search: (( online link research comments ) or ( online chapter6 research study ))*.