Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh hai » thanh phan, thanh hoa, thanh san
su triet » su tien, ve triet
so sach » so sanh, bo sach, co sach
cau luc » cau truc, cau phuc
luc ban » duc ban, cuc ban, luc bat
su viet » so viet
hieu va » lieu va, hieu qua
hieu ve » hieu van
tang ma » mang may, tang van
sach 7 » sach y, sach 2
7 tang » 6 tang

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach 7 tang ma hoa. ((hieu ve) OR (hieu va)) cau luc ban thanh hai ((su triet) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach 7 tang ma hoa. ((hieu ve) OR (hieu va)) cau luc ban thanh hai ((su triet) OR (su viet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach 7 tang ma hoa. ((hieu ve) OR (hieu va)) cau luc ban thanh hai ((su triet) or (su viet))*".