Perhaps you should try some spelling variations:
muong dai » duong dai, mung dai, tuong dai
thu nang » thi nang, thu hang, thu bang
xa muong » ca muong, xa truong, xa dong
sach thu » sach thue, sach thieu, sach tham
so sach » so sanh, bo sach, co sach
dai cuu » dai cua, dai huu
cam tuc » cam xuc, nam thuc, dam thuc
cuu tre » cua tre, cau tren, cau treo
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
cam tu » cam thu, nam tu, dam tu
ma hoi » xa hoi, ma hoa, me hoi

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 nang ((ma hoi) OR (mai 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 nang ((ma hoi) OR (mai 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 nang ((ma hoi) OR (mai hoi)). hieu ve ((cam tuc) or (cam tu)) xa muong dai cuu tre*".