Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
muong doi » huong doi, duong doi, mong doi
xa muong » ca muong, xa truong, xa dong
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
van cau » van dau, van hau, van chat
cua tre » cua te, cuu tre, dua tren
x hoi » xa hoi, o hoi, x ho

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