Perhaps you should try some spelling variations:
thanh vi » hanh vi, thanh va, thanh ve
xa thanh » va thanh, ha thanh, ta thanh
hieu van » hieu va, thien van, lieu va
van nang » van quang, van ban, van dong
su sach » so sach, vu sach
hac tuc » thac toc, thai tuc
van hac » van hoc, van ha, van hai
cua tre » cua te, cuu tre, cua triet
so sanh » do sanh
v nang » va nang, vu nang, voi nang
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (so sanh)) ((v nang) OR (van nang)) x hoi. hieu van hac tuc xa thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sanh)) ((v nang) OR (van nang)) x hoi. hieu van hac tuc xa thanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sanh)) ((v nang) OR (van nang)) x hoi. hieu van hac tuc xa thanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sanh)) ((v nang) OR (van nang)) x hoi. hieu van hac tuc xa thanh vi cua tre*.