Perhaps you should try some spelling variations:
"chien luoc kinh doanh luan van" » "chien luoc kinh doanh nhan van", "chien luoc dinh doanh luan van"
"chien luoc minh OR duc minh doanh luan van" » "chien luoc minh OR duc minh doanh nhan van", "chien luoc dinh OR duc minh doanh luan van", "chien luong minh OR duc minh doanh luan van", "chien ngoc minh OR duc minh doanh luan van", "chien luoc minh OR duc anh doanh luan van"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("chien luoc kinh doanh luan van") or ("chien ((luoc minh) OR (duc minh)) doanh luan van"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("chien luoc kinh doanh luan van") OR ("chien ((luoc minh) OR (duc minh)) doanh luan van")).
• Removing quotes may allow a broader search: (( chien luoc kinh doanh luan van ) or ( chien ((luoc minh) OR (duc minh)) doanh luan van )).
• Adding a wildcard symbol may retrieve word variants: (("chien luoc kinh doanh luan van") or ("chien ((luoc minh) OR (duc minh)) doanh luan van"))*.