Perhaps you should try some spelling variations:
xac danh » xac dinh, tac danh, sach danh
danh sai » dung sai, danh bat, danh dau
nang ma » tang ma, sang ma, nang cao
hieu he » hieu ve, hiem he, hieu le
thu xac » thau xay
cua tre » cuu tre, cua triet, dua tren
sac ky » cac ky, sai ky
he nam » ha nam, nghe nam
cua te » cua tu

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

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