Perhaps you should try some spelling variations:
"online line research documents" » "online line search document", "online line research arguments", "online line research comments", "online online research documents", "online linked research documents", "online line search documents", "online eine research documents", "online life research documents", "online live research documents"
"online chat research elements" » "online chat research experiments", "online chat research effects", "online chat research students", "online chain research elements", "online wheat research elements", "online chaos research elements", "online chapter research elements"
"online what research elements" » "online what research experiments", "online what research effects", "online what research students", "online art research elements", "online hate research elements", "engine what research elements"

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 chat research elements") OR ("online what research elements")))).
• Removing quotes may allow a broader search: (( online line research documents ) or ((( online chat research elements ) or ( online what research elements )))).
• Adding a wildcard symbol may retrieve word variants: (("online line research documents") or ((("online chat research elements") or ("online what research elements"))))*.