Perhaps you should try some spelling variations:
doanh dan » doanh ban, doanh van, doanh dao
van doanh » toan doanh, van dong, van thanh
hieu van » thien van, lieu va, hieu ve
lang van » dang van, tang van, hoang van
hieu va » lieu va, hieu qua
dan cua » dan ca, ban cua, dai cua
duc van » duc va, duc tan, duc manh
lam duc » lam duoc, pham duc, nam duoc
te sach » toc sach
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay
cua tre » cua te, cuu tre, cua triet

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 ((lang xa) or (lang van)) hoi. ((hieu van) OR (hieu va)) lam duc van doanh dan cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((lang xa) OR (lang van)) hoi. ((hieu van) OR (hieu va)) lam duc van doanh dan cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((lang xa) or (lang van)) hoi. ((hieu van) OR (hieu va)) lam duc van doanh dan cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky ((lang xa) or (lang van)) hoi. ((hieu van) OR (hieu va)) lam duc van doanh dan cua tre*.