Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
chieu sang » chieu sach, chieu xanh, hieu lang
nguoi van » nguoi san, nguoi dan, nguoi va
van thanh » ban thanh, van tuan
thanh cao » thanh ca, thanh cac, thanh thao
su thang » su thanh, duc thang, thu thang
su khang » vu khang, huu khang, cuu khang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((hieu quang) or (chieu sang)) - hanh chinh ((su thang) OR (su khang)) nguoi van thanh cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu quang) OR (chieu sang)) - hanh chinh ((su thang) OR (su khang)) nguoi van thanh cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu quang) or (chieu sang)) - hanh chinh ((su thang) OR (su khang)) nguoi van thanh cao".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu quang) or (chieu sang)) - hanh chinh ((su thang) OR (su khang)) nguoi van thanh cao*.