Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
cam truc » cau truc, nam truc, lam truoc
hanh vai » hanh vi, hanh va, hanh tai
hieu va » lieu va, hieu qua
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
co sach » bo sach, cuon sach, hoc sach
su sach » so sach, vu sach
v nang » va nang, vu nang, van nang
ma hoi » mai hoi, xa hoi, ma hoa
va cam » va cham, va cac, va cao
y nang » ky nang, ly nang, may nang
vai va » mai va, dai va, hai va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (co sach)) ((y nang) or (v nang)) ma hoi. hieu va cam truc va hanh vai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (co sach)) ((y nang) OR (v nang)) ma hoi. hieu va cam truc va hanh vai va triet.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (co sach)) ((y nang) or (v nang)) ma hoi. hieu va cam truc va hanh vai va triet*.