Perhaps you should try some spelling variations:
thieu bang » thien bang, thieu khang, thieu quang
cau treo » cau theo, cau tren, cau triet
dua tren » dung tren
hieu van » hieu va, thien van, lieu va
tinh va » tich va, trinh van, trinh vat
su sach » so sach, vu sach
truc va » thuc va, thuc vat, trung va
van cau » van dau, van hau, van chat
bang xa » lang xa, bang va, mang xa
tinh vi » trinh vi, tinh voi, dinh vi

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach thieu bang xa hoi. hieu van cau truc va ((tinh vi) OR (tinh va)) ((dua tren) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thieu bang xa hoi. hieu van cau truc va ((tinh vi) OR (tinh va)) ((dua tren) OR (cau treo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach thieu bang xa hoi. hieu van cau truc va ((tinh vi) OR (tinh va)) ((dua tren) or (cau treo))".
• Adding a wildcard symbol may retrieve word variants: su sach thieu bang xa hoi. hieu van cau truc va ((tinh vi) OR (tinh va)) ((dua tren) or (cau treo))*.