Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
ban hang » ngan hang
phan luc » nhan luc, phan duc, phan suc
su triet » su viet, su tien, ve triet
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
luc ban » duc ban, cuc ban, luc bat
nang xa » lang xa, nang ma, mang xa
hang vi » hang va, hanh vi, hang di
va phan » van phan, va phat, va phap

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 (nang x)) hoi. hieu va phan luc 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) OR (nang x)) hoi. hieu va phan luc 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) OR (nang x)) hoi. hieu va phan luc ban hang vi ((va thiet) or (su triet))*".