Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
kho mang » kho tang, cho mang, pho mang
hieu voi » hieu moi, lieu voi, hieu loi
voi pham » vi pham, toi pham, loai pham
va thanh » gia thanh, va tinh, le thanh
tu cach » tu cac
vu sach » vu bach, su sach, vu khach
may hoi » may thoi, tay hoi, mai hoi
cua tre » cua te, cuu tre, cua triet
do cua » doi cua, co cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (vu sach)) kho mang may hoi. hieu voi pham duc ((va thanh) OR (ban thanh)) do cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (vu sach)) kho mang may hoi. hieu voi pham duc ((va thanh) OR (ban thanh)) do cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (vu sach)) kho mang may hoi. hieu voi pham duc ((va thanh) OR (ban thanh)) do cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (vu sach)) kho mang may hoi. hieu voi pham duc ((va thanh) OR (ban thanh)) do cua tre*.