Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cua viet » ca viet, hoa viet, cua vat
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
va cham » va chat, va tham
ma hoi » mai hoi, xa hoi, ma hoa
y tang » ky tang, 6 tang, 7 tang
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) OR (so sach)) y tang ma hoi. hieu ((va cham) or (vu kham)) duc ban thanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) y tang ma hoi. hieu ((va cham) OR (vu kham)) duc ban thanh vi cua viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) y tang ma hoi. hieu ((va cham) or (vu kham)) duc ban thanh vi cua viet*".