Perhaps you should try some spelling variations:
"online chapter6 research instruments" » "online chapter6 research instrument", "online chapter6 research instrumentation", "online chapter6 research environments", "online chapter research instruments", "online chapter1 research instruments", "online chapter5 research instruments", "online chapters research instruments", "online chapter9 research instruments"
"online lin research documents" » "online lin search document", "online lin research arguments", "online lin research comments", "online line research documents", "online link research documents", "online win research documents", "online li research documents", "online linux research documents"
"online chapter6 research students" » "online chapter research students", "online chapter1 research students", "online chapter5 research students", "online chapter6 research studies", "online chapter6 research study", "online chapter6 research studying", "online chapters research students", "online chapter9 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 lin research documents") OR ((("online chapter6 research students") OR ("online chapter6 research instruments"))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"online lin research documents\") or (((\"online chapter6 research students\") OR (\"online chapter6 research instruments\"))))*".
• Removing quotes may allow a broader search: (( online lin research documents ) or ((( online chapter6 research students ) OR ( online chapter6 research instruments ))))*.