Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
sach ty » sach y, sach tu, xach tay
cua tre » cua te, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
cao tuc » dao tuc, cao duc, cao suc
cuu tre » cau tren, cau treo
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
tuc va » thuc va, truc va, tuc xa
va cao » va cac, va co, va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ty) or (sach thu)) lang xa hoi. hieu va cao tuc va hanh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (sach thu)) lang xa hoi. hieu va cao tuc va hanh vi ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: te ((sach ty) or (sach thu)) lang xa hoi. hieu va cao tuc va hanh vi ((cua tre) or (cuu tre))*.