Perhaps you should try some spelling variations:
muong dai » duong dai, mung dai, tuong dai
hieu van » hieu va, thien van, lieu va
xa muong » ca muong, xa truong, xa dong
nang ma » tang ma, sang ma, nang cao
van cam » van nam, van lam, van cau
cam tuc » cam xuc, cam tu, nam thuc
cua tre » cua te, cuu tre, cua triet
so sac » so sach, so dac
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sac ky ((nang ma) or (van xay)) hoi. hieu van cam tuc xa muong dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sac ky ((nang ma) OR (van xay)) hoi. hieu van cam tuc xa muong dai cua tre.
• Adding a wildcard symbol may retrieve word variants: so sac ky ((nang ma) or (van xay)) hoi. hieu van cam tuc xa muong dai cua tre*.