Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
lam thuoc » nam thuoc, am thuc, cay thuoc
lam duoc » nam duoc, luat duoc, tao duoc
va doanh » van doanh, vay doanh, va danh
lang van » dang van, tang van, hoang van
hieu van » hieu va, thien van, lieu va
te sach » toc sach
van cua » vang cua, ban cua, dan cua
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 ((lam duoc) OR (lam thuoc)) va doanh van 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 ((lam duoc) OR (lam thuoc)) va doanh van 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 ((lam duoc) OR (lam thuoc)) va doanh van cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky ((lang xa) or (lang van)) hoi. hieu van ((lam duoc) OR (lam thuoc)) va doanh van cua tre*.