Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
nang dai » nang dau, nang tai, lang dai
qua nham » qua nhat, qua cham, sua nham
van hanh » van thanh, ban hanh, van anh
cua viet » ca viet, hoa viet, cua vat
so sach » so sanh, bo sach, co sach
dai hoi » dai hoc, dai hai, dai moi
va hanh » va thanh, va danh, ban hanh
vai cua » dai cua, hai cua, lai cua
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach v nang dai hoi. hieu qua nham thuc ((va hanh) or (van hanh)) vai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach v nang dai hoi. hieu qua nham thuc ((va hanh) OR (van hanh)) vai cua viet.
• Adding a wildcard symbol may retrieve word variants: so sach v nang dai hoi. hieu qua nham thuc ((va hanh) or (van hanh)) vai cua viet*.