Perhaps you should try some spelling variations:
viec bach » vien bach, viec ban, viec bao
hieu viec » nhieu viec, hieu ve, sieu viet
sach ty » sach y, sach tu, sach thu
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
ang xa » lang xa, mang xa, dang xay
xac va » tac va, ac va, bac va
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di 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 ty ((ang xa) or (mang may)) hoi. hieu viec bach ((xac va) or (tuc va)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((ang xa) OR (mang may)) hoi. hieu viec bach ((xac va) OR (tuc va)) hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ty ((ang xa) or (mang may)) hoi. hieu viec bach ((xac va) or (tuc va)) hanh vi cua tre*.