Perhaps you should try some spelling variations:
dung sai » dung tai, dung va, dung dat
danh sai » danh bat, danh dau, hanh san
thu xac » thau xay
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach ty, sach kem
hieu he » hieu ve, hiem he, hieu le
nang ma » tang ma, sang ma, nang cao
he nam » ha nam, nghe nam

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach y)) nang ma hoa. hieu he nam thu xac ((danh sai) OR (dung sai)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sach y)) nang ma hoa. hieu he nam thu xac ((danh sai) OR (dung sai)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach y)) nang ma hoa. hieu he nam thu xac ((danh sai) OR (dung sai)) cua tre*.