Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
viec cac » vien cac, viec cua, viec lam
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
va thanh » gia thanh, ban thanh, va tinh
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
nang ma » tang ma, sang ma, nang cao
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach tu nang ma hoi. hieu viec cac nuoc ((va thanh) or (ban hanh)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu nang ma hoi. hieu viec cac nuoc ((va thanh) OR (ban hanh)) vai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach tu nang ma hoi. hieu viec cac nuoc ((va thanh) or (ban hanh)) vai cua tre*.