Perhaps you should try some spelling variations:
sang mai » sang ma, sang tai, lang mai
hanh dai » hanh tai, hanh dao, vanh dai
va triet » va thiet, va trien, ve triet
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ky sang » ky nang, ky dang, ky tang
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
cam tuc » cam tu, nam thuc, dam thuc
va hanh » van hanh, va thanh, va danh
dai va » mai va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky sang mai hoi. hieu ve ((cam tuc) or (cam xuc)) va hanh dai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky sang mai hoi. hieu ve ((cam tuc) OR (cam xuc)) va hanh dai va triet.
• Adding a wildcard symbol may retrieve word variants: su sach ky sang mai hoi. hieu ve ((cam tuc) or (cam xuc)) va hanh dai va triet*.