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
vu kham » vu khanh
duc ban » duc tan, duc van, dua ban
su sach » so sach, vu sach
ve cham » va cham, vu cham, ve chim
tang ma » mang may, tang van
ve chat » va chat, van chat
y tang » ky tang, 6 tang, 7 tang
ma hoi » mai hoi, xa hoi, ma hoa
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 y tang ma hoi. hieu ((((ve cham) OR (ve chat))) OR (vu kham)) duc ban thanh vi su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y tang ma hoi. hieu ((((ve cham) OR (ve chat))) or (vu kham)) duc ban thanh vi su triet~".
• Adding a wildcard symbol may retrieve word variants: su sach y tang ma hoi. hieu ((((ve cham) OR (ve chat))) or (vu kham)) duc ban thanh vi su triet*.