Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
hanh trang » thanh trung, canh tranh, hanh trinh
quang dung » quang trung, ung dung, cuong dung
hien sang » hien trang, khien bang, thien bang
qua dung » su dung, qua song, qua cong
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cao » toan cao, thai cao, than cap

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

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