Perhaps you should try some spelling variations:
qua cham » qua hai, qua cac, va cham
cham duc » pham duc, cham soc, pham duy
ban hanh » ban hang
hanh vai » hanh vi, hanh va, hanh tai
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty dang » ty xang, ky dang, ty hang
dang xa » dang xay, lang xa, dang ha
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cuu tre, cua triet
cua tu » cua tuc, cua su, cua cu

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 ty dang xa hoi. hieu qua cham duc ban hanh vai ((cua tre) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty dang xa hoi. hieu qua cham duc ban hanh vai ((cua tre) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: su sach ty dang xa hoi. hieu qua cham duc ban hanh vai ((cua tre) or (cua tu))*.