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

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