Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh tai » thanh hai, thanh toan, doanh tai
thien van » thi van
tu sach » thu sach, su sach, te sach
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cua triet, dua tren
lam duc » lam duoc, pham duc, nam duoc
hieu va » lieu va, hieu qua
xay hoi » xa hoi, tay hoi, cay phoi
cuu tre » cau tren, cau treo
y van » ly van, ty van, _ van

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y van xay hoi. ((hieu va) or (thien van)) lam duc ban thanh tai ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y van xay hoi. ((hieu va) OR (thien van)) lam duc ban thanh tai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y van xay hoi. ((hieu va) or (thien van)) lam duc ban thanh tai ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: tu sach y van xay hoi. ((hieu va) or (thien van)) lam duc ban thanh tai ((cua tre) OR (cuu tre))*.