Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cham tuc » nham thuc, pham thuc, tham thuc
thi nang » thi cong, ki nang, thi hanh
ban hanh » ban hang
sach thi » sach thu, sach tai, sach thieu
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
hieu vu » hieu va, hieu ve, hieu su
tai hai » thi hai, dai hai, tai ha
tai hoi » tai khoi, dai hoi, tai hoe
vu cham » va cham, vu kham, tu cham

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach thi nang ((tai hoi) OR (tai hai)). hieu vu cham tuc ((va hanh) or (ban hanh)) vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thi nang ((tai hoi) OR (tai hai)). hieu vu cham tuc ((va hanh) OR (ban hanh)) vai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thi nang ((tai hoi) OR (tai hai)). hieu vu cham tuc ((va hanh) or (ban hanh)) vai cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach thi nang ((tai hoi) OR (tai hai)). hieu vu cham tuc ((va hanh) or (ban hanh)) vai cua triet*.