Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh tai » thanh hai, thanh toan, doanh tai
sach thu » sach thue, sach thieu, sach tham
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, xach tay
nam tuc » nam thuc, nam truc, nam tu
tuc ban » thuc ban, truc ban, tu ban
va nam » van nam, ha nam, va nay
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: toc ((sach ty) or (sach thu)) nang xa hoi. hieu va nam tuc ban thanh tai ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ty) OR (sach thu)) nang xa hoi. hieu va nam tuc ban thanh tai ((cua te) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: toc ((sach ty) or (sach thu)) nang xa hoi. hieu va nam tuc ban thanh tai ((cua te) or (cua tu))*.