Perhaps you should try some spelling variations:
xa muong » ca muong, xa truong, o muong
xa dong » ha dong, van dong, lao dong
cam tuc » cam xuc, cam tu, nam thuc
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach kem
cao hoi » cau hoi, co hoi, cao hoc
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao

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