Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
va thanh » gia thanh, ban thanh, va tinh
sach thu » sach thue, sach thieu, sach tham
hieu van » hieu va, thien van, lieu va
tai cua » thai cua, tai cuc, tri cua
nam tuc » nam thuc, nam truc, nam tu
lang xa » lang ha, dang xay, lang van
sach ky » sac ky, sach y, sach kem
sach ty » sach y, sach tu, xach tay
tuc va » thuc va, truc va, tuc xa
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: toc ((sach ky) or (((sach ty) OR (sach thu)))) lang xa hoi. hieu van nam tuc va thanh tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ky) OR (((sach ty) OR (sach thu)))) lang xa hoi. hieu van nam tuc va thanh tai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach ky) or (((sach ty) OR (sach thu)))) lang xa hoi. hieu van nam tuc va thanh tai cua te".
• Adding a wildcard symbol may retrieve word variants: toc ((sach ky) or (((sach ty) OR (sach thu)))) lang xa hoi. hieu van nam tuc va thanh tai cua te*.