Perhaps you should try some spelling variations:
sach tien » sach tren, sach thieu
tien bang » thien bang, mien bang, tien lang
hieu van » hieu va, thien van, lieu va
dua tren » dung tren
cau treo » cau theo, cau tren, cau triet
so sach » so sanh, bo sach, co sach
bang xa » lang xa, bang va, mang xa
van cau » van dau, van hau, van chat
truc va » thuc va, thuc vat, trung va
va dinh » van dinh, va kinh, va tinh
dinh vi » dinh ve, dinh viet, dinh tri

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach tien bang xa hoi. hieu van cau truc va dinh vi ((dua tren) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach tien bang xa hoi. hieu van cau truc va dinh vi ((dua tren) OR (cau treo)).
• Adding a wildcard symbol may retrieve word variants: so sach tien bang xa hoi. hieu van cau truc va dinh vi ((dua tren) or (cau treo))*.