Perhaps you should try some spelling variations:
dang tai » dang thai, dung tai, hang tai
ban hanh » ban hang
ky dang » ky nang, ky danh
tai hoi » tai khoi, dai hoi, tai hai
va pham » van pham, va phat, va phap
va danh » va dinh, va dan, va hanh
cu tren » dua tren
tu tren » tu truyen, tu tieng, tu trong

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cac ky dang tai hoi. lieu va pham duc ((va danh) or (ban hanh)) vai ((cu tren) OR (tu tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky dang tai hoi. lieu va pham duc ((va danh) OR (ban hanh)) vai ((cu tren) OR (tu tren))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky dang tai hoi. lieu va pham duc ((va danh) or (ban hanh)) vai ((cu tren) OR (tu tren))*".