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
va hanh » van hanh, va thanh, va danh
cam tuc » cam tu, nam thuc, dam thuc
hieu va » lieu va, hieu qua
hieu ve » hieu van
ky sang » ky nang, ky dang, ky tang
luu tre » luu tru, cuu tre, luy tre
vi luu » vi lua

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 tuc) OR (cam xuc)) va hanh vi luu 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 tuc) OR (cam xuc)) va hanh vi luu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky sang mai khoi. ((hieu ve) or (hieu va)) ((cam tuc) OR (cam xuc)) va hanh vi luu tre*".