Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh vai » thanh hai, thanh van, thanh tai
hieu vay » hieu va, hieu van, chieu day
vay luan » ly luan, von luan, bai luan
luan duc » xuan duc, luan dac, luan thuc
sach ky » sac ky, sach y, sach ty
duc ban » duc tan, duc van, dua ban
cua tre » cuu tre, cua triet, dua tren
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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: tu ((sach ky) OR (cac ky)) nang x hoi. hieu vay luan duc ban thanh vai ((cua tre) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (cac ky)) nang x hoi. hieu vay luan duc ban thanh vai ((cua tre) OR (cua te))~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (cac ky)) nang x hoi. hieu vay luan duc ban thanh vai ((cua tre) OR (cua te))*.