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
phung cong » phong cong, nhung chong, dung cong
nhung cong » dung cong, thong cong, hang cong
hieu lang » hieu quang, nhieu tang, hieu van
dan toan » van toan, dan than, manh toan
toan cau » toan cao, toan ban, toan tap

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 ((phung cong) or (nhung cong)) dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu lang) OR (chieu sang)) - hanh doanh luan ((phung cong) OR (nhung cong)) dan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu lang) OR (chieu sang)) - hanh doanh luan ((phung cong) or (nhung cong)) dan toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu lang) OR (chieu sang)) - hanh doanh luan ((phung cong) or (nhung cong)) dan toan cau*.