Perhaps you should try some spelling variations:
cham trung » pham trung, pham truong, nam trung
cua triet » su triet, va triet
qua cham » qua hai, qua cac, va cham
trung va » truong va, trang va, trung ha
cua viet » ca viet, hoa viet, cua vat
so sach » so sanh, bo sach, co sach
nang ma » tang ma, sang ma, nang cao
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa

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 y nang ma hoi. hieu qua cham trung va hanh vi ((cua triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang ma hoi. hieu qua cham trung va hanh vi ((cua triet) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: so sach y nang ma hoi. hieu qua cham trung va hanh vi ((cua triet) or (cua viet))*.