Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
viec cac » vien cac, viec cua, viec lam
sach thu » sach thue, sach thieu, sach tham
hanh hai » thanh hai, nhanh hai, hang hai
hai cua » thai cua, dai cua, hoi cua
su sach » so sach, vu sach
mang xa » mang may, dang xay, mang cua
lang xa » lang ha, dang xay, lang van
tuc va » thuc va, truc va, duc va
cua tu » cua tuc, cua su, cua cu

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 thu ((mang xa) or (lang xa)) hoi. hieu viec cac ((tuc va) OR (tuc xa)) hanh hai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thu ((mang xa) OR (lang xa)) hoi. hieu viec cac ((tuc va) OR (tuc xa)) hanh hai cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach thu ((mang xa) or (lang xa)) hoi. hieu viec cac ((tuc va) OR (tuc xa)) hanh hai cua tu".
• Adding a wildcard symbol may retrieve word variants: su sach thu ((mang xa) or (lang xa)) hoi. hieu viec cac ((tuc va) OR (tuc xa)) hanh hai cua tu*.