Perhaps you should try some spelling variations:
va triet » va trien, ve triet, cua triet
hanh tai » thanh tai, hang tai, han tai
su sach » so sach, vu sach
ky sang » ky nang, ky dang, ky tang
sang ma » tang ma, nang ma, sang tao
cam tuc » cam tu, nam thuc, dam thuc
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, va danh
ma hoi » mai hoi, xa hoi, ma hoa
thiet » thieu

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 ma hoi. hieu qua ((cam tuc) or (cam xuc)) va hanh tai ((va triet) OR (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky sang ma hoi. hieu qua ((cam tuc) OR (cam xuc)) va hanh tai ((va triet) OR (va thiet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky sang ma hoi. hieu qua ((cam tuc) or (cam xuc)) va hanh tai ((va triet) OR (va thiet))*".