Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
trinh quan » trinh luat, trinh han
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, 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: doi ((chieu xanh) or (hieu lang)) - hanh ((trinh quan) OR (tinh quang)) nhung cong dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu xanh) OR (hieu lang)) - hanh ((trinh quan) OR (tinh quang)) nhung cong dan than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu xanh) or (hieu lang)) - hanh ((trinh quan) OR (tinh quang)) nhung cong dan than cau".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu xanh) or (hieu lang)) - hanh ((trinh quan) OR (tinh quang)) nhung cong dan than cau*.