Perhaps you should try some spelling variations:
"online chapter1 research experiments" » "online chapter1 research experimental", "online chapter1 research experience", "online chapter1 research experiences", "online chapter research experiments", "online chapter5 research experiments", "online chapter6 research experiments", "online chapters research experiments", "online chapter9 research experiments"
"online line research documents" » "online line search document", "online line research arguments", "online line research comments", "online life research documents", "online online research documents", "online linked research documents", "online eine research documents", "online live research 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 line research documents") OR ("online chapter1 research experiments"))*.
• Removing quotes may allow a broader search: (( online line research documents ) or ( online chapter1 research experiments ))*.