Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
hanh tranh » canh tranh, hanh trang, lanh tranh
hanh trinh » canh tranh, hanh chinh
cong thanh » dong thanh, cong trinh, cong tan
ho chieu » theo chieu, hoc thieu, doi chieu
qua dung » quang dung, su dung, qua song
cong dan » cong san, cong tan, huong dan
chan cao » chan cho, chat cao, chay cao

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

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