Perhaps you should try some spelling variations:
mai khoi » mai khoa, tai khoa, cac khoi
ban hanh » ban hang
va triet » va thiet, va trien, ve triet
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
mai hoi » dai hoi, lai hoi, mai doi
thi van » thi lan, thi hanh, thi nang
van cau » van dau, van hau, van chat
cau duc » cao duc, cau luc, chu duc
duc ban » duc tan, duc van, dua ban
ma hoi » xa hoi, ma hoa, me hoi
vi va » vi van, vai va, vu va

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 ky nang ((ma hoi) or (((mai hoi) OR (mai khoi)))). thi van cau duc ban hanh vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((ma hoi) OR (((mai hoi) OR (mai khoi)))). thi van cau duc ban hanh vi va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((ma hoi) or (((mai hoi) OR (mai khoi)))). thi van cau duc ban hanh vi va triet".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((ma hoi) or (((mai hoi) OR (mai khoi)))). thi van cau duc ban hanh vi va triet*.