Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
su triet » su viet, su tien, ve triet
va triet » va thiet, va trien, ve triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
van cam » van nam, van lam, van cau
xuc ban » duc ban, cuc ban, quoc ban

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 nang ma hoa. hieu van cam xuc ban hanh vi ((su triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ma hoa. hieu van cam xuc ban hanh vi ((su triet) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ma hoa. hieu van cam xuc ban hanh vi ((su triet) or (va triet))*.