Perhaps you should try some spelling variations:
sach tham » sach nha
tham tang » nham tang, thai tang, tham lang
cua triet » cua viet, va triet
su triet » su viet, su tien, ve triet
dan hang » ban hang, van hang, dat hang
thuc dan » thuc hanh, hoc dan, thuc vat
hang di » hang doi, hang vi, hang dien
tang ma » mang may, tang van
so sach » so sanh, bo sach, co sach
he nam » nghe nam
ma hoi » mai hoi, xa hoi, ma hoa

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

• If you are trying to use Boolean operators, they must be ALL CAPS: so sach tham tang ma hoi. hiem ((he nam) OR (ha nam)) thuc dan hang di ((cua triet) OR (su triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach tham tang ma hoi. hiem ((he nam) OR (ha nam)) thuc dan hang di ((cua triet) or (su triet))~".
• Adding a wildcard symbol may retrieve word variants: so sach tham tang ma hoi. hiem ((he nam) OR (ha nam)) thuc dan hang di ((cua triet) or (su triet))*.