Perhaps you should try some spelling variations:
hang khoa » dung khoa
ban thanh » ban hanh, ban hang
khoa hoi » khoan hoi, khoa hoc, khoa doi
ky hang » ky nang, ly hang, ky dang
hieu le » hieu ve, hieu he, hieu ly
thu ban » thu hang
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
le nam » ly nam, he nam, le na
vai su » van su, lai su, tai su

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky hang khoa hoi. hieu le nam thu ban thanh ((vai su) or (va su)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky hang khoa hoi. hieu le nam thu ban thanh ((vai su) OR (va su)) triet.
• Adding a wildcard symbol may retrieve word variants: te sac ky hang khoa hoi. hieu le nam thu ban thanh ((vai su) or (va su)) triet*.