Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
sach ky » sac ky, sach y, sach ty
lai cuu » lai cua, lai chau, lai cuoc
tu sach » thu sach, su sach, te sach
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
cuu tre » cua tre, cau tren, cau treo
ve cac » va cac
ma hoi » mai hoi, xa hoi, ma hoa
va dan » ca dan, va dau, va dap
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 ma hoi. hieu ((ve cac) OR (vien cac)) dac ((va dan) OR (va dao)) lai cuu tre~.
• Adding a wildcard symbol may retrieve word variants: tu sach ky sang ma hoi. hieu ((ve cac) or (vien cac)) dac ((va dan) or (va dao)) lai cuu tre*.