Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hanh lai » hanh lam, hanh tai, thanh lap
vuc nang » cuc nang, vu nang, chuc nang
trung va » truong va, trang va, trung ha
truc va » thuc va, thuc vat
lai cua » dai cua, hai cua, lai chau
su sach » so sach, vu sach
qua cau » quan cau, qua cac, qua ca
ma hoi » mai hoi, xa hoi, ma hoa
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: su sach ((v nang) or (vuc nang)) ma hoi. hieu qua cau ((truc va) OR (trung va)) hanh lai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((v nang) OR (vuc nang)) ma hoi. hieu qua cau ((truc va) OR (trung va)) hanh lai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((v nang) or (vuc nang)) ma hoi. hieu qua cau ((truc va) OR (trung va)) hanh lai cua viet".
• Adding a wildcard symbol may retrieve word variants: su sach ((v nang) or (vuc nang)) ma hoi. hieu qua cau ((truc va) OR (trung va)) hanh lai cua viet*.