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
va triet » va thiet, va trien, ve triet
su triet » su viet, su tien, ve triet
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » hieu qua
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 hoi. ((hieu va) OR (lieu va)) nhan dua ban hanh vi ((va triet) OR (su triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang xa hoi. ((hieu va) OR (lieu va)) nhan dua ban hanh vi ((va triet) OR (su triet))".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. ((hieu va) OR (lieu va)) nhan dua ban hanh vi ((va triet) OR (su triet))*.