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

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 va doanh van ((cua tre) OR (cua triet))~.
• 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 va doanh van ((cua tre) OR (cua triet)).
• 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 va doanh van ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: te sach ky ((lang xa) or (lang van)) hoi. hieu van lam duoc va doanh van ((cua tre) OR (cua triet))*.