Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
va trien » va truyen, va thiet, va tuyen
va doanh » van doanh, vay doanh, va danh
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
te sach » toc sach
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
cac tuc » cac toc, cac tu, cac tac
ve cac » va cac, vien cac
tuc va » thuc va, truc va, tuc xa

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 ((nang xa) OR (lang xa)) hoi. hieu ve cac tuc va doanh van ((cua tre) or (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((nang xa) OR (lang xa)) hoi. hieu ve cac tuc va doanh van ((cua tre) OR (va trien))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((nang xa) OR (lang xa)) hoi. hieu ve cac tuc va doanh van ((cua tre) or (va trien))*".