Perhaps you should try some spelling variations:
sach danh » sach tranh, sach dao, sach dung
xac danh » xac dinh, tac danh, cac doanh
va triet » va thiet, va trien, ve triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky sang » ky nang, ky dang, ky tang
sang ma » tang ma, nang ma, sang tao
hieu he » hieu ve, hiem he, hieu le
he nam » ha nam, nghe nam
bat va » ban va, dat va, vat va

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