Perhaps you should try some spelling variations:
ban thai » ban than, ban thi, ban tai
nang ma » tang ma, sang ma, nang cao
vu cham » vu kham, tu cham, qua cham
va cham » va tham
va chat » van chat, va phat, cao chat
thai va » thai van
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa
va ban » van ban, va bai, va bao
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky nang ma hoi. hieu ((((vu cham) or (va cham))) or (va chat)) duc va ban thai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang ma hoi. hieu ((((vu cham) OR (va cham))) OR (va chat)) duc va ban thai va thiet.
• Adding a wildcard symbol may retrieve word variants: su sac ky nang ma hoi. hieu ((((vu cham) or (va cham))) or (va chat)) duc va ban thai va thiet*.