Perhaps you should try some spelling variations:
sang mai » sang ma, lang mai, hoang mai
sang tai » hang tai, sang tao, tang tai
tu sach » thu sach, su sach, te sach
lai cuu » lai cua, lai chau, lai cuoc
va daoh » va danh, va doanh
cac duc » cac du, cao duc, cac dac
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
cuu tre » cua tre, cau tren, cau treo
va dao » ca dao

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 ((sang mai) OR (sang tai)) hoi. hieu va cac duc ((va daoh) OR (va dao)) lai cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((sang mai) OR (sang tai)) hoi. hieu va cac duc ((va daoh) or (va dao)) lai cuu tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((sang mai) OR (sang tai)) hoi. hieu va cac duc ((va daoh) or (va dao)) lai cuu tre*.