Perhaps you should try some spelling variations:
muong doi » huong doi, duong doi, mong doi
van chat » cao chat
xa muong » ca muong, xa truong, xa dong
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
x hoi » xa hoi, x ho, 5 hoi
o hoi » co hoi, o hoc, o hai

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 ((x hoi) OR (o hoi)). hieu ((van nam) or (van chat)) tuc xa muong doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang ((x hoi) OR (o hoi)). hieu ((van nam) OR (van chat)) tuc xa muong doi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang ((x hoi) OR (o hoi)). hieu ((van nam) or (van chat)) tuc xa muong doi cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach ky nang ((x hoi) OR (o hoi)). hieu ((van nam) or (van chat)) tuc xa muong doi cua tre*.