Perhaps you should try some spelling variations:
hiem ngheo » giam ngheo, nhiem nghe
hieu nghe » lieu nghe, nhiem nghe, hieu he
danh sai » dung sai, danh bat, danh dau
cau tren » cu tren, dau tren, ca tren
sach ky » sach y, sach ty, sach kem
nang ma » tang ma, sang ma, nang cao
xa danh » va danh, dia danh, nam danh
sai cau » lai chau, mai chau, hai chau
sac ky » cac ky, sai ky
thu xa » thu xac, thu ha, thu xe

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 (sac ky)) nang ma hoa. ((hieu nghe) OR (hiem ngheo)) nam thu xa danh sai cau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sac ky)) nang ma hoa. ((hieu nghe) or (hiem ngheo)) nam thu xa danh sai cau tren~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sac ky)) nang ma hoa. ((hieu nghe) or (hiem ngheo)) nam thu xa danh sai cau tren*.