Perhaps you should try some spelling variations:
"Quản trị tinh doanh." » "Quản trị trinh doanh." (Expand Search), "Quản trị kinh doanh." (Expand Search), "Quản trị hinh doanh." (Expand Search)
"quan tri tinh doanh." » "quan tri trinh doanh." (Expand Search), "quan tri kinh doanh." (Expand Search), "quan tri hinh doanh." (Expand Search), "quan tri lich doanh." (Expand Search), "quan moi tinh doanh." (Expand Search), "quan vi tinh doanh." (Expand Search)
"quan tri kinh doan." » "quan tri kinh doanh." (Expand Search), "quan tri minh doan." (Expand Search), "quan tri binh doan." (Expand Search), "quan trien kinh doan." (Expand Search)

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: (((("Quản trị tinh doanh.") OR ("quan tri tinh doanh."))) OR ("quan tri kinh doan."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"Quản trị tinh doanh.\") OR (\"quan tri tinh doanh.\"))) OR (\"quan tri kinh doan.\"))".
• Removing quotes may allow a broader search: (((( Quản trị tinh doanh. ) OR ( quan tri tinh doanh. ))) OR ( quan tri kinh doan. )).
• Adding a wildcard symbol may retrieve word variants: (((("Quản trị tinh doanh.") OR ("quan tri tinh doanh."))) OR ("quan tri kinh doan."))*.