Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
viec cac » vien cac, viec cua, viec lam
cua viet » ca viet, hoa viet, cua vat
sach ty » sach y, sach tu, sach thu
sach lo » sach dao, sach doi, sach hoi
hang xa » hoang xa, hang va, hang ca
cac thu » cach thuc, cac thoi
va hanh » van hanh, va thanh, va danh
thu va » thuc va, thue va, tu va
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) or (sach lo)) hang xa hoi. hieu viec cac thu va hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach lo)) hang xa hoi. hieu viec cac thu va hanh vi cua viet.
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (sach lo)) hang xa hoi. hieu viec cac thu va hanh vi cua viet*.