Perhaps you should try some spelling variations:
doanh than » doanh thanh, doanh nhan, doanh phan
su triet » su viet, su tien, ve triet
hieu van » hieu va, thien van, lieu va
va doanh » van doanh, vay doanh, va danh
chat luc » chat xuc, chat lua, nhan luc
van chat » cao chat
nang mai » nang ma, nang tai, lang mai
mai hoi » mai khoi, dai hoi, lai hoi
sach ky » sac ky, sach kem, sach hay
sach ty » sach tu, sach thu, xach tay
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 ty))) or (sach y)) nang mai hoi. 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 ty))) OR (sach y)) nang mai hoi. 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 ty))) or (sach y)) nang mai hoi. hieu van chat luc va doanh than su triet".
• Adding a wildcard symbol may retrieve word variants: te ((((sach ky) OR (sach ty))) or (sach y)) nang mai hoi. hieu van chat luc va doanh than su triet*.