Perhaps you should try some spelling variations:
thanh vi » hanh vi, thanh va, thanh ve
da thanh » dao thanh, dat thanh, dam thanh
su sach » so sach, vu sach
cac tac » cac toc, cac bac, cac dac
hieu va » lieu va, hieu qua
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 va cac tac da 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 va cac tac da 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 va cac tac da thanh vi cua tre*.