Perhaps you should try some spelling variations:
sanh thien » sach thieu, hanh thiet, manh tien
thien bang » khien bang, thien ban, thien dang
cau treo » cau theo, cau tren, cau triet
dua tren » dung tren
dinh tri » chinh tri
hieu van » hieu va, thien van, lieu va
va dinh » van dinh, va kinh, va tinh
so sanh » do sanh
truc va » thuc va, thuc vat, trung va
van cau » van dau, van hau, van chat
va hoi » va hoc, va hoa

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 thien bang ((va hoi) OR (xa hoi)). hieu van cau truc va dinh tri ((dua tren) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh thien bang ((va hoi) OR (xa hoi)). hieu van cau truc va dinh tri ((dua tren) OR (cau treo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh thien bang ((va hoi) OR (xa hoi)). hieu van cau truc va dinh tri ((dua tren) or (cau treo))".
• Adding a wildcard symbol may retrieve word variants: so sanh thien bang ((va hoi) OR (xa hoi)). hieu van cau truc va dinh tri ((dua tren) or (cau treo))*.