Perhaps you should try some spelling variations:
phuong cong » phuong dong, phong cong, phung cong
hieu quang » thieu quang, hieu qua, diep quang
nhanh lang » nhanh quang, nhanh thang, nhan dang
hieu quan » hieu qua, lieu quan, thien quan
va phuong » va thuong, cac phuong
lang va » lang van, hang va, lang ha
dan van » dang van, doan van, tan van
dao van » do van, dang van

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 (hieu quan)) - nhanh lang va phuong cong ((dan van) or (dao van)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu quang) OR (hieu quan)) - nhanh lang va phuong cong ((dan van) OR (dao van)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu quang) OR (hieu quan)) - nhanh lang va phuong cong ((dan van) or (dao van)) ban".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu quang) OR (hieu quan)) - nhanh lang va phuong cong ((dan van) or (dao van)) ban*.