Perhaps you should try some spelling variations:
mai khoi » mai khoa, tai khoa, cac khoi
danh hai » dang hai, lanh hai, manh hai
xac danh » xac dinh, tac danh, sach danh
hai cua » thai cua, dai cua, hoi cua
thu xac » thau xay
hieu he » hieu ve, hiem he, hieu le
cua tre » cua te, cuu tre, cua triet
sach ky » sach y, sach ty, sach kem
ma hoi » mai hoi, xa hoi, ma hoa
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: su ((sach ky) or (sac ky)) sang ((ma hoi) or (mai khoi)). hieu he nam thu xac danh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sac ky)) sang ((ma hoi) OR (mai khoi)). hieu he nam thu xac danh hai cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sac ky)) sang ((ma hoi) or (mai khoi)). hieu he nam thu xac danh hai cua tre*.