Perhaps you should try some spelling variations:
xa muong » ca muong, xa truong, o muong
cao hoi » cau hoi, co hoi, tao hoi
cao hoc » co hoc, cho hoc, chat hoc
hieu ve » hieu va, hieu van
cam tuc » cam xuc, cam tu, nam thuc
xa dong » ha dong, van dong, lao dong
cua tre » cua te, cuu tre, cua triet
so sac » so sach, so dac
sac ky » cac ky, sai ky
ve cam » ve cham, ve cac, va cam

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