Perhaps you should try some spelling variations:
khong hoang » khung hoang, thong hoang, khong hoan
hanh doanh » hang doanh, chinh doanh, doanh doanh
chiet tach » chieu sach
hieu lang » chieu sang, hieu quang, nhieu tang
doanh hua » doanh cua, doanh ha, doanh khoa
hua khong » hoa khong, cua khong, hoac khong
hoang van » hang va
tuan ban » tuan bang, toan ban, quang ban
luan ban » luan van, luan san, luan han

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((hieu lang) or (chiet tach)) - hanh doanh hua khong hoang van ((tuan ban) OR (luan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((hieu lang) OR (chiet tach)) - hanh doanh hua khong hoang van ((tuan ban) OR (luan ban))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((hieu lang) or (chiet tach)) - hanh doanh hua khong hoang van ((tuan ban) OR (luan ban))*".