Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh do » thanh de, thanh pho, thanh hoa
su sach » so sach, vu sach
van hoe » van hoc, van hieu, van hien
sach ky » sac ky, sach y, sach ty
hoc ban » hoc bang, hoc dan, hoc bai
do cua » doi cua, co cua, de cua
cua te » cua tu
va lam » van lam, va lap
va am » va cam

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 ky nang ((van hoa) or (van hoe)). hieu ((va am) OR (va lam)) hoc ban thanh do cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((van hoa) OR (van hoe)). hieu ((va am) OR (va lam)) hoc ban thanh do cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((van hoa) or (van hoe)). hieu ((va am) OR (va lam)) hoc ban thanh do cua te".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((van hoa) or (van hoe)). hieu ((va am) OR (va lam)) hoc ban thanh do cua te*.