Perhaps you should try some spelling variations:
sanh thu » sach thu, san thu, doanh thu
thu xang » thu hang, thu bang, thu dang
hieu van » hieu va, thien van, lieu va
so sanh » do sanh
xang xa » lang xa, mang xa, ang xa
van cac » van hac, van cau, van bac
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
xac va » tac va, ac va, bac va

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