Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
nhan dua » nhan cua, phan dua, nhan luan
ban hanh » ban hang
su triet » su viet, su tien, ve triet
sach ky » sac ky, sach y, sach ty
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
va nhan » van nhan, ca nhan, va phan
dua ban » dia ban, cua ban, qua ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky ((nang xa) OR (lang xa)) hoi. hieu va nhan dua ban hanh vi ((va thiet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((nang xa) OR (lang xa)) hoi. hieu va nhan dua ban hanh vi ((va thiet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((nang xa) OR (lang xa)) hoi. hieu va nhan dua ban hanh vi ((va thiet) or (su triet))".
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((nang xa) OR (lang xa)) hoi. hieu va nhan dua ban hanh vi ((va thiet) or (su triet))*.