Perhaps you should try some spelling variations:
muong doi » huong doi, duong doi, mong doi
xa muong » ca muong, xa truong, xa dong
nam thuc » nam thuoc, am thuc, nam thu
hieu van » hieu va, thien van, lieu va
cam tuc » cam xuc, cam tu, dam thuc
doi cua » dai cua, hoi cua
sach tu » sach thu, cach tu, sach uu
nang xa » nang x, lang xa, nang ma
sach ty » sach y, sach thu, xach tay
cua tre » cua te, cuu tre, cua triet

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: bo ((sach tu) OR (sach ty)) nang xa hoi. hieu van ((cam tuc) or (nam thuc)) xa muong doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo ((sach tu) OR (sach ty)) nang xa hoi. hieu van ((cam tuc) OR (nam thuc)) xa muong doi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "bo ((sach tu) OR (sach ty)) nang xa hoi. hieu van ((cam tuc) or (nam thuc)) xa muong doi cua tre".
• Adding a wildcard symbol may retrieve word variants: bo ((sach tu) OR (sach ty)) nang xa hoi. hieu van ((cam tuc) or (nam thuc)) xa muong doi cua tre*.