Perhaps you should try some spelling variations:
dung sai » dung tai, dung va, dung dat
nam dung » nam vung, nam dong, am dung
sai cua » dai cua, hai cua, lai cua
thu nam » tu nam, thu nhap, thu nhat
sach ky » sac ky, sach y, sach kem
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
sach ty » sach y, sach tu, sach thu
le nam » ly nam, he nam, te nam
le na » le va, le ta, le ha

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ky) or (sach ty)) nang xa hoi. hieu ((le nam) or (le na)) thu nam dung sai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach ty)) nang xa hoi. hieu ((le nam) OR (le na)) thu nam dung sai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach ty)) nang xa hoi. hieu ((le nam) or (le na)) thu nam dung sai cua tre*.