Perhaps you should try some spelling variations:
dam thanh » dao thanh, nam thanh, am thanh
thanh vi » hanh vi, thanh va, thanh ve
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
tac dam » tac da, tac dao, tac dau
cac tac » cac toc, cac bac, cac dac
van cac » van hac, van cau, van bac
cua tre » cua te, cuu tre, cua triet
nang xa » lang xa, nang ma, mang xa
so sanh » do sanh
vi cua » vai cua, di cua

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: ((su sach) OR (so sanh)) va ((nang xa) OR (nang x)) hoi. hieu van cac tac dam thanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sanh)) va ((nang xa) OR (nang x)) hoi. hieu van cac tac dam thanh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sanh)) va ((nang xa) OR (nang x)) hoi. hieu van cac tac dam thanh vi cua tre*.