Perhaps you should try some spelling variations:
hanh doanh » hang doanh, chinh doanh, doanh doanh
chieu sang » chieu sach, chieu xanh, nhieu tang
doanh luan » doanh nhan
hieu lang » hieu quang, nhieu tang, hieu van
bang cong » dang cong, bang song, dung cong
hang cong » dang cong, hang nong, thanh cong
tuan phan » luan phan, toan phan, tuan pham
phan cau » phan dau, phan cac, phan tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu lang) OR (chieu sang)) - hanh doanh luan ((bang cong) or (hang cong)) tuan phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu lang) OR (chieu sang)) - hanh doanh luan ((bang cong) OR (hang cong)) tuan phan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu lang) OR (chieu sang)) - hanh doanh luan ((bang cong) or (hang cong)) tuan phan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu lang) OR (chieu sang)) - hanh doanh luan ((bang cong) or (hang cong)) tuan phan cau*.