Perhaps you should try some spelling variations:
doanh dan » doanh ban, doanh van, doanh dao
van doanh » toan doanh, van dong, van thanh
te sach » toc sach
hieu va » lieu va, hieu qua
dan cua » dan ca, ban cua, dai cua
tac van » tac vang, cac van, tac va
cac tac » cac toc, cac bac, cac dac
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu ve » hieu van
ky dang » ky nang, ky danh
ha hoi » hoa hoi, ha noi, 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: te sach ky dang ((ha hoi) OR (xa 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 dang ((ha hoi) OR (xa 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 dang ((ha hoi) OR (xa hoi)). ((hieu ve) or (hieu va)) cac tac van doanh dan cua tre*".