Perhaps you should try some spelling variations:
sang mai » sang ma, sang tai, lang mai
mai khoi » mai khoa, tai khoa, cac khoi
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
ky sang » ky nang, ky dang, ky tang
hieu ve » hieu van
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
cam tu » cam thu, nam tu, dam tu
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: so sach ky sang mai khoi. ((hieu ve) or (hieu va)) cam tu va hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky sang mai khoi. ((hieu ve) OR (hieu va)) cam tu va hanh vi cuu tre*.