Perhaps you should try some spelling variations:
van doanh » toan doanh, van dong, van thanh
su triet » su viet, su tien, ve triet
kho tang » cao tang
ky tang » ky nang, ky dang, ky trong
hoc van » hoc dan, hoc va, hoc vat
cac hoc » cach hoc, cac hop, bac hoc
hieu va » lieu va, hieu qua
hoa hoi » khoa hoi, hoa hoc, hoa doi
tai su » tai so, tai tu, lai su
su xac » pu xac, su cac
ha hoi » ha noi, xa hoi, va hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: su xac ((ky tang) OR (kho tang)) ((ha hoi) or (hoa hoi)). hieu va cac hoc van doanh tai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su xac ((ky tang) OR (kho tang)) ((ha hoi) OR (hoa hoi)). hieu va cac hoc van doanh tai su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su xac ((ky tang) OR (kho tang)) ((ha hoi) or (hoa hoi)). hieu va cac hoc van doanh tai su triet*".