Perhaps you should try some spelling variations:
muong dong » muong doong, muong duong, tuong dong
hieu van » hieu va, thien van, lieu va
dong cua » dung cua, cong cua, huong cua
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
van hau » van ha, van hai, van dau
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
cua tre » cua te, cuu tre, cua triet
tuc mo » tuc mot, duc mo, toc mo

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