Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
bac truc » ba truc, bac trung, sach truc
dang xay » dang van, van xay
va doanh » van doanh, vay doanh, va danh
hieu van » hieu va, thien van, lieu va
te sach » toc sach
cua tre » cuu tre, cua triet, dua tren
truc va » thuc va, thuc vat, trung va
van bac » van ban, van bao, van hac
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
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 ((nang xa) or (dang xay)) hoi. hieu van bac truc va doanh van ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((nang xa) OR (dang xay)) hoi. hieu van bac truc va doanh van ((cua tre) OR (cua te))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((nang xa) or (dang xay)) hoi. hieu van bac truc va doanh van ((cua tre) OR (cua te))*".