Perhaps you should try some spelling variations:
"trieu thi luan van minh doanh" » "trieu thi luan van minh danh", "trieu thi luan van minh doan", "trieu thi luan van chinh doanh", "trieu thi lan van minh doanh", "trieu thi xuan van minh doanh", "trieu thi loan van minh doanh", "thieu thi luan van minh doanh", "trien thi luan van minh doanh", "tieu thi luan van minh doanh"
"sieu thi luan van kinh doanh" » "sieu thi lan van kinh doanh", "sieu thi xuan van kinh doanh", "sieu thi loan van kinh doanh", "dieu tri luan van kinh doanh", "su thi luan van kinh doanh", "tiep thi luan van kinh doanh", "sieu thi luan va kinh doanh", "sieu thi luan van dinh doanh", "sieu thi luan van binh doanh"

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: (("trieu thi luan van minh doanh") or ("sieu thi luan van kinh doanh"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("trieu thi luan van minh doanh") OR ("sieu thi luan van kinh doanh")).
• Removing quotes may allow a broader search: (( trieu thi luan van minh doanh ) or ( sieu thi luan van kinh doanh )).
• Adding a wildcard symbol may retrieve word variants: (("trieu thi luan van minh doanh") or ("sieu thi luan van kinh doanh"))*.