Perhaps you should try some spelling variations:
doanh than » doanh thanh, doanh nhan, doanh phan
su triet » su viet, su tien, ve triet
va doanh » van doanh, vay doanh, va danh
chat luc » chat xuc, chat lua, nhan luc
van chat » cao chat
hieu van » hieu va, thien van, lieu va
mai khoi » mai khoa, tai khoa, cac khoi
sach ky » sac ky, sach ty, sach kem
mai hoi » dai hoi, lai hoi, mai doi
than su » nhan su, tan su, than so
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ky) or (sach y)) nang ((mai hoi) OR (mai khoi)). hieu van chat luc va doanh than su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach y)) nang ((mai hoi) OR (mai khoi)). hieu van chat luc va doanh than su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) or (sach y)) nang ((mai hoi) OR (mai khoi)). hieu van chat luc va doanh than su triet".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) or (sach y)) nang ((mai hoi) OR (mai khoi)). hieu van chat luc va doanh than su triet*.