Perhaps you should try some spelling variations:
thuoc ban » thuoc tan, thuoc dang, thu ban
ban hanh » ban hang
sang ky » sang kyo, dang ky, tang ky
dang ma » dang mau, dang mam, dang mat
vi cua » vai cua, di cua
va nam » van nam, ha nam, va nay
san ky » van ky, dan ky, ban ky
ma hoi » mai hoi, xa hoi, ma hoa
cua te » cua tu
le na » le nam, le va, le ta

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: va ((san ky) OR (sang ky)) dang ma hoi. hieu ((va nam) OR (le na)) thuoc ban hanh vi cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "va ((san ky) OR (sang ky)) dang ma hoi. hieu ((va nam) or (le na)) thuoc ban hanh vi cua te~".
• Adding a wildcard symbol may retrieve word variants: va ((san ky) OR (sang ky)) dang ma hoi. hieu ((va nam) or (le na)) thuoc ban hanh vi cua te*.