Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
hieu lang » chieu sang, nhieu tang, hieu van
canh manh » lanh manh, canh tranh, cach mang
cua nhung » va nhung
cong danh » cuong danh, cong thanh, cong khanh
manh cua » doanh cua, ban cua
cong dan » cong san, cong tan, huong dan

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((hieu lang) OR (hieu quang)) - canh manh cua nhung ((cong danh) or (cong dan)) phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((hieu lang) OR (hieu quang)) - canh manh cua nhung ((cong danh) OR (cong dan)) phan tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((hieu lang) OR (hieu quang)) - canh manh cua nhung ((cong danh) or (cong dan)) phan tu".
• Adding a wildcard symbol may retrieve word variants: doi ((hieu lang) OR (hieu quang)) - canh manh cua nhung ((cong danh) or (cong dan)) phan tu*.