Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
thai cua » than cua, tai cuc, tri cua
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, ang xa, dang xay
mang xa » lang xa, mang may, dang xay
va hanh » va thanh, va danh, ban hanh
cua tre » cua te, cuu tre, cua triet
va bac » van bac, va cac, va bai

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ty ((xang xa) or (mang xa)) hoi. lieu va bac xuc ((va hanh) or (van hanh)) thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty ((xang xa) OR (mang xa)) hoi. lieu va bac xuc ((va hanh) OR (van hanh)) thai cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ty ((xang xa) or (mang xa)) hoi. lieu va bac xuc ((va hanh) or (van hanh)) thai cua tre*.