Perhaps you should try some spelling variations:
dang xay » dang van, van xay
cau treo » cau theo, cau tren, cau triet
hieu van » hieu va, thien van, lieu va
sach thu » sach thue, sach thieu, sach tham
xay hoi » xa hoi, tay hoi, cay phoi
sach ky » sac ky, sach y, sach ty
nam tuc » nam thuc, nam truc, nam tu
va hanh » van hanh, va thanh, va danh
cu tren » tu tren, dua tren
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc ((sach ky) or (sach thu)) dang xay hoi. hieu van nam tuc va hanh vi ((cau treo) or (cu tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc ((sach ky) OR (sach thu)) dang xay hoi. hieu van nam tuc va hanh vi ((cau treo) OR (cu tren)).
• Adding a wildcard symbol may retrieve word variants: thuoc ((sach ky) or (sach thu)) dang xay hoi. hieu van nam tuc va hanh vi ((cau treo) or (cu tren))*.