Perhaps you should try some spelling variations:
mai khoi » mai khoa, tai khoa, cac khoi
cam truc » cau truc, nam truc, lam truoc
hanh dai » hanh tai, hanh dao, vanh dai
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
ma hoi » mai hoi, xa hoi, ma hoa
va cam » va cham, va cac, va cao
cua tu » cua tuc, cua su, cua cu

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 v nang ((ma hoi) or (mai khoi)). hieu va cam truc va hanh dai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v nang ((ma hoi) OR (mai khoi)). hieu va cam truc va hanh dai cua tu.
• Adding a wildcard symbol may retrieve word variants: su sach v nang ((ma hoi) or (mai khoi)). hieu va cam truc va hanh dai cua tu*.