Perhaps you should try some spelling variations:
thu xang » thu hang, thu bang, thu sang
thu dang » thu hang, thu bang, thu dong
hieu van » hieu va, thien van, lieu va
so sanh » do sanh
van cac » van hac, van cau, van bac
cua tre » cua te, cuu tre, cua triet
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 sanh ((thu xang) OR (thu dang)) 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 sanh ((thu xang) OR (thu dang)) 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 sanh ((thu xang) OR (thu dang)) xa hoi. hieu van cac ((xac va) or (duc va)) hanh vi cua tre*".