Perhaps you should try some spelling variations:
thu xang » thu hang, thu bang, thu dang
hieu van » hieu va, thien van, lieu va
xang xa » lang xa, mang xa, ang xa
van cac » van hac, van cau, van bac
cua tre » cua te, cuu tre, cua triet
so san » so sanh, ho san
so ban » sao ban, so bang, co ban
xac va » tac va, ac va, bac va
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so san) OR (so ban)) thu xang xa hoi. hieu van cac ((xac va) or (duc va)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so san) OR (so ban)) thu xang xa hoi. hieu van cac ((xac va) OR (duc va)) hanh vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so san) OR (so ban)) thu xang xa hoi. hieu van cac ((xac va) or (duc va)) hanh vi cua tre*".