Perhaps you should try some spelling variations:
ban hanh » ban hang
va thanh » gia thanh, ban thanh, va tinh
te sach » toc sach
ky tang » ky nang, ky dang, kho tang
tang ma » mang may, tang van
doi cua » dai cua, hoi cua
sach ky » sac ky, sach y, sach ty
ve cac » va cac, vien cac
ve cao » va cao, ve bao, ve co
cua te » cua tu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky tang ma hoa. hieu ((ve cao) OR (ve cac)) duc ((ban hanh) OR (va thanh)) doi cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky tang ma hoa. hieu ((ve cao) OR (ve cac)) duc ((ban hanh) or (va thanh)) doi cua te~".
• Adding a wildcard symbol may retrieve word variants: te sach ky tang ma hoa. hieu ((ve cao) OR (ve cac)) duc ((ban hanh) or (va thanh)) doi cua te*.