Perhaps you should try some spelling variations:
ca trung » cua trung, cac trung, cao trung
trung ha » trung hoc, trung tam, trung cap
va trien » va truyen, va thiet, va tuyen
cua viet » ca viet, hoa viet, cua vat
co sach » bo sach, cuon sach, hoc 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: co sach y nang ma hoi. hieu qua ca trung ha hanh vi ((va trien) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach y nang ma hoi. hieu qua ca trung ha hanh vi ((va trien) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: co sach y nang ma hoi. hieu qua ca trung ha hanh vi ((va trien) or (cua viet))*.