Perhaps you should try some spelling variations:
thieu bang » thien bang, thieu khang, thieu quang
dua tren » dung tren
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
so sach » so sanh, bo sach, co sach
va tinh » may tinh
cuu tre » cua tre, cau tren, cau treo
va dinh » van dinh, va kinh, vu dinh
bang xa » lang xa, bang va, mang xa

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 thieu bang xa hoi. hieu van nam thuc ((va dinh) or (va tinh)) vi ((dua tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach thieu bang xa hoi. hieu van nam thuc ((va dinh) OR (va tinh)) vi ((dua tren) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: so sach thieu bang xa hoi. hieu van nam thuc ((va dinh) or (va tinh)) vi ((dua tren) or (cuu tre))*.