Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
va triet » va thiet, va trien, ve triet
ban hang » ngan hang
nhan duc » nhan duoc, nhan luc, phan duc
su triet » su viet, su tien, ve triet
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
hieu va » lieu va, hieu qua
duc ban » duc tan, duc van, dua ban
tu cach » tu cac
hang di » hang doi, hang vi, hang dien
va nhan » van nhan, ca nhan, va phan

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) or (tu cach)) ky lang xa hoi. hieu va nhan duc ban hang di ((va triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu cach)) ky lang xa hoi. hieu va nhan duc ban hang di ((va triet) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (tu cach)) ky lang xa hoi. hieu va nhan duc ban hang di ((va triet) or (su triet))*.