Perhaps you should try some spelling variations:
muong dai » duong dai, mung dai, tuong dai
sach thue » sach thieu, sach tham, cach thuc
sach thu » sach thieu, sach tham, cach thuc
xa muong » ca muong, xa truong, xa dong
dai cuu » dai cua, dai huu
cam tuc » cam xuc, nam thuc, dam thuc
cuu tre » cua tre, cau tren, cau treo
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
ma hoi » mai hoi, xa hoi, ma hoa
cam tu » cam thu, nam tu, dam tu

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 thu) OR (sach thue)) nang ma hoi. hieu ve ((cam tuc) or (cam tu)) xa muong dai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sach thu) OR (sach thue)) nang ma hoi. hieu ve ((cam tuc) OR (cam tu)) xa muong dai cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so ((sach thu) OR (sach thue)) nang ma hoi. hieu ve ((cam tuc) or (cam tu)) xa muong dai cuu tre*".