Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
hanh tranh » canh tranh, hanh trang, lanh tranh
hanh trinh » canh tranh, hanh chinh
hieu lang » chieu sang, nhieu tang, hieu van
va trong » va truong, va thong, va tuong
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh 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 lang) OR (hieu quang)) - ((hanh tranh) or (hanh trinh)) va trong cong dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (hieu quang)) - ((hanh tranh) OR (hanh trinh)) va trong cong dan toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu lang) OR (hieu quang)) - ((hanh tranh) or (hanh trinh)) va trong cong dan toan ban".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) OR (hieu quang)) - ((hanh tranh) or (hanh trinh)) va trong cong dan toan ban*.