Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hanh dai » hanh tai, hanh dao, vanh dai
va hanh » van hanh, va thanh, va danh
cam tuc » cam tu, nam thuc, dam thuc
sach ky » sac ky, sach y, sach ty
su sach » so sach, vu sach
sang ma » tang ma, sang tao, mang may
nang ma » tang ma, nang cao, mang may
hieu ve » hieu va, hieu van
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 ma) OR (nang ma)) 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 ma) OR (nang ma)) hoi. hieu ve ((cam tuc) OR (cam xuc)) va hanh dai va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((sang ma) OR (nang ma)) 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 ma) OR (nang ma)) hoi. hieu ve ((cam tuc) or (cam xuc)) va hanh dai va triet*.