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
vu kham » vu khanh
duc ban » duc tan, duc van, dua ban
su sach » so sach, vu sach
va cham » va chat, va tham
tang ma » tang van
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 y ((tang ma) OR (mang may)) 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 y ((tang ma) OR (mang may)) 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 y ((tang ma) OR (mang may)) hoi. hieu ((va cham) or (vu kham)) duc ban thanh vi cua viet*".