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
xang xa » mang xa, ang xa, dang xay
lang xa » lang ha, dang xay, lang van
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 ((xang xa) OR (lang 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 ((xang xa) OR (lang xa)) hoi. hieu qua cham duc ban hanh vai ((cua tre) OR (cua tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((xang xa) OR (lang 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 ((xang xa) OR (lang xa)) hoi. hieu qua cham duc ban hanh vai ((cua tre) or (cua tu))*.