Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
phan duc » pham duc, phan tu, phan dau
ban hang » ngan hang
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 » lieu va
duc ban » duc tan, duc van, dua ban
hang vi » hang va, hanh vi, hang di

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 (hieu qua)) phan duc ban hang vi ((va thiet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang xa hoi. ((hieu va) OR (hieu qua)) phan duc ban hang vi ((va thiet) 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 (hieu qua)) phan duc ban hang vi ((va thiet) or (su triet))*".