Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
vay doanh » van doanh, ly doanh, voi doanh
va triet » va thiet, va trien, ve triet
nang han » nang phan, nang hang, nang hanh
cac tuc » cac toc, cac tu, cac nuoc
cac tac » cac toc, cac bac, cac dac
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
nang ha » nang hai, nang hoa, lang ha
van va » van vat, van van, ban 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 ((nang ha) OR (nang han)) hoi. hieu ve ((cac tuc) or (cac tac)) vay doanh van va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((nang ha) OR (nang han)) hoi. hieu ve ((cac tuc) OR (cac tac)) vay doanh van va triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((nang ha) OR (nang han)) hoi. hieu ve ((cac tuc) or (cac tac)) vay doanh van va triet*".