Perhaps you should try some spelling variations:
sang mai » sang ma, sang tai, lang mai
mai khoi » mai khoa, tai khoa, cac khoi
danh vai » danh sai, danh va, doanh van
tu sach » thu sach, su sach, te sach
cam tuc » cam xuc, cam tu, nam thuc
vai cuu » vai cua
va danh » va dinh, va dan, va hanh
cuu tre » cua tre, cau tren, cau treo
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
hieu ve » hieu van
ky sang » ky nang, ky dang, ky tang
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: tu sach ky sang mai khoi. ((hieu ve) or (hieu va)) cam tuc va danh vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky sang mai khoi. ((hieu ve) OR (hieu va)) cam tuc va danh vai cuu tre*.