Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
te sach » toc sach
cua tre » cua te, cua triet, dua tren
hanh ve » hanh vi, hanh va, hanh kem
va hanh » van hanh, va thanh, va danh
truc va » thuc va, thuc vat, trung va
hieu va » lieu va, hieu qua
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
cuu tre » cau tren, cau treo
ma hoi » mai hoi, xa hoi, ma hoa
va cau » van cau, va cac, va dau

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) or (thu sach)) ky tang ma hoi. hieu va cau truc va hanh ve ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thu sach)) ky tang ma hoi. hieu va cau truc va hanh ve ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thu sach)) ky tang ma hoi. hieu va cau truc va hanh ve ((cua tre) or (cuu tre))*.