Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
lam duoc » nam duoc, luat duoc, lam thuoc
va doanh » van doanh, vay doanh, va danh
lang van » dang van, tang van, hoang van
te sach » toc sach
cua tre » cuu tre, cua triet, dua tren
duoc va » nuoc va, duc va, duoc ma
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay
va lam » van lam, va lap
cua te » cua tu

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