Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cham duc » pham duc, cham soc, pham duy
va thanh » gia thanh, va tinh, le thanh
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
va cham » va chat, va tham
lap cua » lai cua, tap cua, lam cua
cua tre » cua te, cuu tre, cua triet
y sang » _ sang, duy sang
ma hoi » mai hoi, xa hoi, me hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y sang ((ma hoi) or (ma hoa)). hieu va cham duc ((va thanh) OR (ban thanh)) lap cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y sang ((ma hoi) OR (ma hoa)). hieu va cham duc ((va thanh) OR (ban thanh)) lap cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y sang ((ma hoi) or (ma hoa)). hieu va cham duc ((va thanh) OR (ban thanh)) lap cua tre*".