Perhaps you should try some spelling variations:
doanh dan » doanh ban, doanh van, doanh dao
van doanh » toan doanh, van dong, van thanh
dan cua » dan ca, ban cua, dai cua
tac van » tac vang, cac van, tac va
cac tac » cac toc, cac bac, cac dac
hieu va » lieu va, hieu qua
hieu ve » hieu van
sach ky » sach y, sach ty, sach kem
dang ha » dong ha, dung ha, lang ha
cua tre » cua te, cuu tre, cua triet
ha hoi » hoa hoi, ha noi, xa hoi
sac ky » cac ky, sai ky

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