Perhaps you should try some spelling variations:
hieu viec » nhieu viec, sieu viet, hieu hien
sach nuoc » sach duoc, cac nuoc, bach tuoc
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, mang xa
danh di » danh du, xanh di, danh dien
nang ma » tang ma, sang ma, nang cao
va danh » va dinh, va dan, va hanh
di cua » dai cua, doi cua, de cua
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky ((nang xa) or (nang ma)) hoi. ((hieu viec) or (hieu ve)) sach nuoc va danh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky ((nang xa) OR (nang ma)) hoi. ((hieu viec) OR (hieu ve)) sach nuoc va danh di cua tre.
• Adding a wildcard symbol may retrieve word variants: su sac ky ((nang xa) or (nang ma)) hoi. ((hieu viec) or (hieu ve)) sach nuoc va danh di cua tre*.