Perhaps you should try some spelling variations:
hieu viec » nhieu viec, sieu viet, hieu hien
sach duoc » sach nuoc, sach dao, sach dung
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
dinh di » dinh du, dinh vi, danh di
va dinh » van dinh, va kinh, va tinh
duoc va » nuoc va, duc va, duoc ma
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
di cua » dai cua, doi cua, de cua

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 ky ((nang xa) or (nang ma)) hoi. ((hieu viec) or (hieu ve)) sach duoc va dinh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang xa) OR (nang ma)) hoi. ((hieu viec) OR (hieu ve)) sach duoc va dinh di cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang xa) or (nang ma)) hoi. ((hieu viec) or (hieu ve)) sach duoc va dinh di cua tre*.