Perhaps you should try some spelling variations:
muong doong » muong duong, tuong duong, cuong duong
muong dong » muong duong, tuong dong, huong dong
hieu van » hieu va, thien van, lieu va
so sach » so sanh, bo sach, co sach
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
cam tuc » cam xuc, nam thuc, dam thuc
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
cam tu » cam thu, nam tu, dam tu

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