Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
su triet » su viet, su tien, ve triet
thanh vi » hanh vi, thanh va, thanh ve
duc ban » duc tan, duc van, dua ban
vu kham » vu khanh
su sach » vu sach
tang ma » mang may, tang van
so sach » so sanh, bo sach, co sach
ve cham » va cham, ve chat, vu cham
ma hoi » mai hoi, xa hoi, ma hoa
y tang » ky tang, 6 tang, 7 tang
vi su » va su, ve su, ki su

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: ((su sach) OR (so sach)) y tang ma hoi. hieu ((ve cham) OR (vu kham)) duc ban thanh vi su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) y tang ma hoi. hieu ((ve cham) or (vu kham)) duc ban thanh vi su triet~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) y tang ma hoi. hieu ((ve cham) or (vu kham)) duc ban thanh vi su triet*.