Perhaps you should try some spelling variations:
"online chapter research comments" » "online chapter research commons", "online chapter research commentary", "online chapter research community", "online chapter1 research comments", "online chapter5 research comments", "online chapter6 research comments", "line chapter research comments", "engine chapter research comments", "pipeline chapter research comments"
"online sale research contents" » "online sale research content", "online sale research context", "online sale research concepts", "online scale research contents", "online sales research contents", "online shale research contents", "online self research contents", "online safety research contents"

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 chapter research comments") OR ("online sale research contents"))*.
• Removing quotes may allow a broader search: (( online chapter research comments ) or ( online sale research contents ))*.