Perhaps you should try some spelling variations:
"line chinese research documents" » "line chinese search document", "line chinese research arguments", "line chinese research comments", "line china research documents", "line japanese research documents", "line disease research documents", "online chinese research documents", "some chinese research documents"
"china chinese research documents" » "china chinese search document", "china chinese research arguments", "china chinese research comments", "china china research documents", "china japanese research documents", "china disease research documents"
"online rand research contents" » "online rand research content", "online rand research context", "online rand research concepts", "online brand research contents", "online range research contents", "online ad research contents", "online band research contents", "online hand research contents"
"online card research contents" » "online card research content", "online card research context", "online card research concepts", "online care research contents", "online based research contents", "online car research contents", "online case research contents"

Try widening your search to All Fields.

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: (((("line chinese research documents") OR ("china chinese research documents"))) OR ((("online rand research contents") OR ("online card research contents")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"line chinese research documents\") OR (\"china chinese research documents\"))) or (((\"online rand research contents\") or (\"online card research contents\"))))".
• Removing quotes may allow a broader search: (((( line chinese research documents ) OR ( china chinese research documents ))) or ((( online rand research contents ) or ( online card research contents )))).
• Adding a wildcard symbol may retrieve word variants: (((("line chinese research documents") OR ("china chinese research documents"))) or ((("online rand research contents") or ("online card research contents"))))*.