Perhaps you should try some spelling variations:
sach tay » xach tay, sach hay, sach nay
tay lang » tai lang, tay tang, tay quang
hieu van » hieu va, thien van, lieu va
nam thue » nam thu, nam thuc, lam thue
so sach » so sanh, bo sach, co sach
thue va » thuc va, thuyet va, thuc vat
va dang » van dang, va nang, va lang
de cua » te cua, dieu cua
le cua » ly cua

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 van nam thue va dang ((de cua) or (le 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 van nam thue va dang ((de cua) OR (le cua)) te.
• Adding a wildcard symbol may retrieve word variants: so sach tay lang ((xa hoi) or (ha noi)). hieu van nam thue va dang ((de cua) or (le cua)) te*.