Perhaps you should try some spelling variations:
quang trong » quang truong, quang trung, quan trong
chieu xanh » chieu sach, chieu sang, chieu tinh
hanh trang » thanh trung, canh tranh, hanh trinh
trang tran » trang trai, trung tran, trang tuan
dung thang » hung thang, cung thang, dung thuong
dung toan » dung doanh, dung thanh, dung tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu xanh) or (dieu hanh)) - hanh trang tran quang trong ((dung toan) OR (dung thang)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu xanh) OR (dieu hanh)) - hanh trang tran quang trong ((dung toan) OR (dung thang)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu xanh) or (dieu hanh)) - hanh trang tran quang trong ((dung toan) OR (dung thang)) cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu xanh) or (dieu hanh)) - hanh trang tran quang trong ((dung toan) OR (dung thang)) cao*.