Perhaps you should try some spelling variations:
xa muong » ca muong, xa truong, o muong
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
cao hoi » cau hoi, cao hoc, tao hoi
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
xa dong » ha dong, van dong, lao dong
cua tre » cua te, cuu tre, cua triet
co hoi » co hoc, co loi
va cam » va cham, va cac, va cao

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