Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
ke trang » ke toan
trang ha » trang va, trung ha, tang ha
hieu van » hieu va, thien van, hieu ve
thanh di » thanh doi, thanh de, thanh do
su sach » so sach, vu 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
sach ke » sach kem, sach de, sach che
cuu tre » cau tren, cau treo
ha hoi » hoa hoi, ha noi, xa hoi

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ke trang ha hoi. ((hieu van) OR (lieu va)) lam duc ban thanh di ((cua tre) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ke trang ha hoi. ((hieu van) or (lieu va)) lam duc ban thanh di ((cua tre) OR (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: su sach ke trang ha hoi. ((hieu van) or (lieu va)) lam duc ban thanh di ((cua tre) OR (cuu tre))*.