Perhaps you should try some spelling variations:
xac danh » xac dinh, tac danh, sach danh
so sach » so sanh, bo sach, co sach
hai cua » thai cua, dai cua, hoi cua
bai cua » ban cua, dai cua, bai ca
sai cua » dai cua, lai cua, mai cua
thu xac » thau xay
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
ve nam » he nam, va nam, le nam
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky sang ma hoi. hieu ve nam thu xac danh ((((sai cua) or (bai cua))) or (hai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky sang ma hoi. hieu ve nam thu xac danh ((((sai cua) OR (bai cua))) OR (hai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: so sach ky sang ma hoi. hieu ve nam thu xac danh ((((sai cua) or (bai cua))) or (hai cua)) tre*.