Perhaps you should try some spelling variations:
doanh tang » doanh sang, doanh tong, doanh thanh
van doanh » toan doanh, van dong, van thanh
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, hieu ve
tang cua » mang cua, hang cua, tang luan
sach ky » sac ky, sach y, sach kem
sach ty » sach y, sach tu, sach thu
cac tac » cac toc, cac bac, cac dac
tac van » tac vang, cac van, tac va
x hoi » xa hoi, o hoi, x ho

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)) nang x hoi. ((hieu van) or (lieu va)) cac tac van doanh tang cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach ty)) nang x hoi. ((hieu van) OR (lieu va)) cac tac van doanh tang cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) OR (sach ty)) nang x hoi. ((hieu van) or (lieu va)) cac tac van doanh tang cua triet*".