Perhaps you should try some spelling variations:
sach kem » hanh kem
hau truc » cau truc, hang truc, hoc truc
hanh dai » hanh tai, hanh dao, vanh dai
hieu va » lieu va, hieu qua
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
cua tre » cuu tre, cua triet, dua tren
sac ky » cac ky, sai ky
va hau » van hau, va chau, vat hau
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach kem) OR (sac ky)) nang x hoi. hieu va hau truc va hanh dai ((cua tre) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach kem) or (sac ky)) nang x hoi. hieu va hau truc va hanh dai ((cua tre) OR (cua te))~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach kem) or (sac ky)) nang x hoi. hieu va hau truc va hanh dai ((cua tre) OR (cua te))*.