Perhaps you should try some spelling variations:
thang nguoi » thanh nguoi, thong nguoi, tang nguoi
hieu quang » thieu quang, hieu quan, hieu qua
chieu sang » chieu sach, chieu xanh, hieu lang
chinh su » hinh su, chinh phu, chinh ta
su thang » su thanh, su khang, duc thang
van toan » van tan, van thanh, manh toan
van tuan » van quan, van ban, anh tuan

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