Perhaps you should try some spelling variations:
"online life research documents" » "online life search document", "online life research arguments", "online life research comments", "online eine research documents", "online online research documents", "online lehre research documents"
"online chapter6 research elements" » "online chapter research elements", "online chapter5 research elements", "online chapter7 search elements", "online chapter6 research experiments", "online chapter6 research effects", "online chapter6 research students", "online chapters research elements", "online chapter9 research elements"
"online chapter1 research elements" » "online chapter1 research experiments", "online chapter1 research effects", "online chapter1 research students", "online chapter research elements", "online chapter5 research elements", "online chapter7 search elements", "online chapters research elements", "online chapter9 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 life research documents") OR ((("online chapter6 research elements") OR ("online chapter1 research elements")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"online life research documents\") or (((\"online chapter6 research elements\") OR (\"online chapter1 research elements\"))))".
• Removing quotes may allow a broader search: (( online life research documents ) or ((( online chapter6 research elements ) OR ( online chapter1 research elements )))).
• Adding a wildcard symbol may retrieve word variants: (("online life research documents") or ((("online chapter6 research elements") OR ("online chapter1 research elements"))))*.