Perhaps you should try some spelling variations:
"online link research elements" » "online link research experiments", "online link research students", "online link research contents", "online line research elements", "online linked research elements", "online liner research elements", "online linux research elements", "online think research elements", "online eine research elements"
"online chapter research effects" » "online chapter1 research effects", "online chapter5 research effects", "online chapter6 research effects", "online chapter research efforts", "online chapter research aspects", "online chapter research projects", "line chapter research effects", "engine chapter research effects"

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 elements") OR ("online chapter research effects"))*.
• Removing quotes may allow a broader search: (( online link research elements ) or ( online chapter research effects ))*.