Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
van hanh » van thanh, ban hanh, van anh
sach tu » cach tu, sach ty, sach uu
nang ma » tang ma, sang ma, nang cao
qua cai » qua hai, qua cac, qua ca
cai xuc » cam xuc, chat xuc
xuc van » duc van, luc van, vuc van
cuu tre » cua tre, cau tren, cau treo
ma hoi » mai hoi, xa hoi, ma hoa
vi cuu » vi luu, vinh cuu

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 thu) or (sach tu)) nang ma hoi. hieu qua cai xuc van hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach thu) OR (sach tu)) nang ma hoi. hieu qua cai xuc van hanh vi cuu tre*.