Perhaps you should try some spelling variations:
"online car research documents" » "online car research arguments", "online car research catchments", "online car research students", "online care research documents", "online card research documents", "online cars research documents", "online chat research documents", "online ch research documents", "online co research documents"
"online case research comments" » "online case research commons", "online case research contents", "online case research commentary", "online use research comments", "online abuse research comments", "online disease research comments", "online class research comments", "online classes research comments"
"online brand search document" » "online bin search document", "online brand research document", "online branded search document", "online branch search document"
"online hand search document" » "online band search document", "online handel search document", "online hate search document", "online hana search document", "online hard search document", "online paid search document"

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: (((("online car research documents") OR ("online case research comments"))) OR ((("online hand search document") OR ("online brand search document")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"online car research documents\") or (\"online case research comments\"))) or (((\"online hand search document\") OR (\"online brand search document\"))))".
• Removing quotes may allow a broader search: (((( online car research documents ) or ( online case research comments ))) or ((( online hand search document ) OR ( online brand search document )))).
• Adding a wildcard symbol may retrieve word variants: (((("online car research documents") or ("online case research comments"))) or ((("online hand search document") OR ("online brand search document"))))*.