Perhaps you should try some spelling variations:
"tiep thi nang van minh doanh" » "tiep thi nang van kinh doanh", "tiep thi nang van minh danh", "tiep thi nang van minh doan", "tiep thi cong van minh doanh", "tiep ki nang van minh doanh", "tiep thi hanh van minh doanh", "tiep thi dang van minh doanh", "tiep thi tang van minh doanh", "tiep thi lang van minh doanh", "tien thi nang van minh doanh", "tieu thi nang van minh doanh"
"trieu thi lan van minh doanh" » "trieu thi lan van kinh doanh", "trieu thi lan van minh danh", "trieu thi lan van minh doan", "trieu thi hanh van minh doanh", "trieu thi lien van minh doanh", "trieu thi luan van minh doanh", "trieu thi lang van minh doanh", "trieu thi tan van minh 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: (("tiep thi nang van minh doanh") or ("trieu thi lan van minh doanh"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("tiep thi nang van minh doanh") OR ("trieu thi lan van minh doanh")).
• Removing quotes may allow a broader search: (( tiep thi nang van minh doanh ) or ( trieu thi lan van minh doanh )).
• Adding a wildcard symbol may retrieve word variants: (("tiep thi nang van minh doanh") or ("trieu thi lan van minh doanh"))*.