Perhaps you should try some spelling variations:
trung va » truong va, trang va, trung ha
hanh dai » hanh tai, hanh dao, vanh dai
cua viet » ca viet, hoa viet, cua vat
su sach » so sach, vu sach
qua cau » quan cau, qua cac, qua ca
truc va » thuc va, thuc vat
v nang » va nang, vu nang, van nang
ma hoi » mai hoi, xa hoi, ma hoa
chuc » thuc, chu, chua

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