Perhaps you should try some spelling variations:
muong dai » duong dai, mung dai, tuong dai
xa muong » ca muong, xa truong, xa dong
nam thuc » nam thuoc, am thuc, nam thu
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
cam tuc » cam xuc, dam thuc, nam truc
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
cam tu » cam thu, nam tu, dam tu
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky nang ma hoi. hieu va ((((cam tuc) OR (nam thuc))) or (cam tu)) xa muong dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang ma hoi. hieu va ((((cam tuc) OR (nam thuc))) OR (cam tu)) xa muong dai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang ma hoi. hieu va ((((cam tuc) OR (nam thuc))) or (cam tu)) xa muong dai cua tre*".