Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
van lam » van nam
hanh va » hang va, hanh vi
duc van » duc va, duc tan, duc manh
van cam » van nam, van cau, van dam
sach ty » sach y, sach tu, sach thu
xay hoi » tay hoi, cay phoi, gay thoi
ty dang » ty xang, ky dang, ty hang
cua tre » cua te, cuu tre, cua triet
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty dang ((xay hoi) or (xa hoi)). hieu ((van cam) or (van lam)) duc van hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty dang ((xay hoi) OR (xa hoi)). hieu ((van cam) OR (van lam)) duc van hanh va cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ty dang ((xay hoi) or (xa hoi)). hieu ((van cam) or (van lam)) duc van hanh va cua tre*.