Perhaps you should try some spelling variations:
doanh van » doan van, doanh ban, doanh nhan
hieu van » hieu va, thien van, lieu va
ban truc » ba truc, ban thuoc, xuan truc
doanh va » doan va, doanh tai, doanh cua
dang xay » dang van, van xay
truc va » thuc va, thuc vat, trung va
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
sac ky » cac ky, sai ky
te sac » te sach, te cac, te san

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky ((nang xa) or (dang xay)) hoi. hieu van ban truc va ((doanh van) OR (doanh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky ((nang xa) OR (dang xay)) hoi. hieu van ban truc va ((doanh van) OR (doanh va)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky ((nang xa) or (dang xay)) hoi. hieu van ban truc va ((doanh van) OR (doanh va)) cua tre*".