Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
qua cham » qua hai, qua cac, va cham
cham duc » pham duc, cham soc, pham duy
danh vai » danh sai, danh va, doanh van
vu sach » vu bach, su sach, vu khach
lang xa » lang ha, dang xay, lang van
va danh » va dinh, va dan, va hanh
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach thu ((lang xa) or (nang cao)) hoi. hieu qua cham duc va danh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach thu ((lang xa) OR (nang cao)) hoi. hieu qua cham duc va danh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: vu sach thu ((lang xa) or (nang cao)) hoi. hieu qua cham duc va danh vai cua tre*.