Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
chieu xanh » chieu sach, chieu sang, chieu tinh
hanh trang » thanh trung, canh tranh, minh trang
hanh trinh » canh tranh, hanh chinh
quang dung » quang trung, ung dung, cuong dung
dung cong » dung trong
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan tap » toan ban

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

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