Perhaps you should try some spelling variations:
nam thue » nam thu, nam thuc, nam hue
sach tay » xach tay, sach hay, sach nay
tay lang » tai lang, tay tang, tay quang
lam thue » luat thue, lam thuoc, loai thue
dung de » dung he, dung dat
va dung » van dung, va duong, vat dung
so sach » so sanh, bo sach, co sach
hieu ve » hieu va, hieu van
de cua » le cua, te cua, dieu cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach tay lang ((xa hoi) or (ha noi)). hieu ve ((nam thue) OR (lam thue)) va dung de cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach tay lang ((xa hoi) OR (ha noi)). hieu ve ((nam thue) OR (lam thue)) va dung de cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach tay lang ((xa hoi) or (ha noi)). hieu ve ((nam thue) OR (lam thue)) va dung de cua te".
• Adding a wildcard symbol may retrieve word variants: so sach tay lang ((xa hoi) or (ha noi)). hieu ve ((nam thue) OR (lam thue)) va dung de cua te*.