Perhaps you should try some spelling variations:
dung sai » dung tai, dung va, dung dat
xac dung » xay dung, tac dung, sach dung
sai cua » dai cua, hai cua, lai cua
thu xac » thau xay
hieu he » hieu ve, hiem he, hieu le
nang ma » tang ma, sang ma, nang cao
sach tu » sach thu, cach tu, sach ty
cua tre » cua te, cuu tre, cua triet
he nam » ha nam, nghe nam
sac ky » cac ky, sai ky

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 y) or (sac ky))) or (sach tu)) nang ma hoa. hieu he nam thu xac dung sai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((((sach y) OR (sac ky))) OR (sach tu)) nang ma hoa. hieu he nam thu xac dung sai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((((sach y) or (sac ky))) or (sach tu)) nang ma hoa. hieu he nam thu xac dung sai cua tre*.