Perhaps you should try some spelling variations:
"online linux research comments" » "online linux research commons", "online linux research contents", "online linux research commentary", "online line research comments", "online liner research comments", "online link research comments", "online eine research comments", "online life research comments", "online live research comments"
"online chapter1 research study" » "online chapter research study", "online chapter5 research study", "online chapter6 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 linux research comments") OR ("online chapter1 research study"))*.
• Removing quotes may allow a broader search: (( online linux research comments ) or ( online chapter1 research study ))*.