Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cham loc » cham soc, chon loc, cham o
hanh dai » hanh tai, hanh dao, vanh dai
lang xa » lang ha, dang xay, lang van
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
su sac » su sach, su cac, su xac
o lang » hoa lang, hoi lang
loc va » hoc va, luc va

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: su sac o lang xa hoi. ((hieu van) OR (hieu qua)) cham loc va hanh dai cua tre~.
• Adding a wildcard symbol may retrieve word variants: su sac o lang xa hoi. ((hieu van) or (hieu qua)) cham loc va hanh dai cua tre*.