Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hanh dai » hanh tai, hanh dao, vanh dai
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty mang » ty xang, ty hang, tin mang
mang xa » lang xa, mang may, dang xay
duc van » duc va, duc tan, duc manh
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, ve cai
va cam » va cham, va cac, va cao

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 ty mang xa hoi. hieu ((ve cam) or (va cam)) duc van hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty mang xa hoi. hieu ((ve cam) OR (va cam)) duc van hanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty mang xa hoi. hieu ((ve cam) or (va cam)) duc van hanh dai cua tre*.