Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
hieu quang » thieu quang, hieu quan, hieu qua
hieu manh » chieu xanh, hieu nganh, dieu hanh
tranh cua » doanh cua, manh cua
dong ban » dong bang, dong san, dong bac
ban toan » bai toan, ban than, van toan
toan ban » van ban

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 manh) or (((chieu sang) or (hieu quang)))) - canh tranh cua cong dong ban toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu manh) OR (((chieu sang) OR (hieu quang)))) - canh tranh cua cong dong ban toan ban.
• Adding a wildcard symbol may retrieve word variants: ho ((hieu manh) or (((chieu sang) or (hieu quang)))) - canh tranh cua cong dong ban toan ban*.