Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
nang dai » nang dau, nang tai, lang dai
qua pham » quan pham, quy pham, qua cham
van hanh » van thanh, ban hanh, van anh
cua viet » ca viet, hoa viet, cua vat
bo sach » co sach, hoc 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: bo sach v nang dai hoi. hieu qua pham thuc ((va hanh) or (van hanh)) vai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach v nang dai hoi. hieu qua pham thuc ((va hanh) OR (van hanh)) vai cua viet.
• Adding a wildcard symbol may retrieve word variants: bo sach v nang dai hoi. hieu qua pham thuc ((va hanh) or (van hanh)) vai cua viet*.