Perhaps you should try some spelling variations:
sach danh » sach tranh, sach dao, sach dung
cua triet » cua viet, su triet, va triet
xac danh » xac dinh, tac danh, cac doanh
ky tang » ky nang, ky dang, kho tang
tang ma » mang may, tang van
hieu he » hieu ve, hiem he, hieu le
bat cua » ban cua, mat cua, bai cua
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa
he nam » ha nam, nghe nam

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 tang ma hoi. hieu he nam thu ((xac danh) or (sach danh)) bat cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky tang ma hoi. hieu he nam thu ((xac danh) OR (sach danh)) bat cua triet.
• Adding a wildcard symbol may retrieve word variants: tu sac ky tang ma hoi. hieu he nam thu ((xac danh) or (sach danh)) bat cua triet*.