Perhaps you should try some spelling variations:
dung sai » dung tai, dung va, dung dat
sach ky » sac ky, sach kem, sach hay
sach ty » sach tu, sach thu, xach tay
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
xa dung » xay dung, xa dong, va dung
sai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
ve nam » he nam, va nam, le nam
thu xa » thu xac, thu ha, thu xe

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