Perhaps you should try some spelling variations:
ca trung » cua trung, cac trung, cao trung
trung ha » trung hoc, trung tam, trung cap
va triet » va thiet, va trien, ve triet
cua viet » ca viet, hoa viet, cua vat
so sach » so sanh, bo sach, co sach
nang ma » tang ma, sang ma, nang cao
ha hanh » ha thanh, nha hanh, ha anh
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
qua ca » qua cac, qua cua, qua cai

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 ca trung ha hanh vi ((va 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 ca trung ha hanh vi ((va triet) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: so sach y nang ma hoi. hieu qua ca trung ha hanh vi ((va triet) or (cua viet))*.