Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, diep quang
nhanh mang » nhanh lang, nhanh quang, nhanh thang
hanh mang » hanh trang, nhanh lang, thanh hang
tong cong » trong cong, cong cong, dung cong
cong doan » cong dan, cong hoan, dong doanh
doan van » doan va, hoang van, luan van
va tong » va thong, va tuong, va trong

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 qua)) - ((nhanh mang) or (hanh mang)) va tong cong doan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu quang) OR (hieu qua)) - ((nhanh mang) OR (hanh mang)) va tong cong doan van ban*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu quang) OR (hieu qua)) - ((nhanh mang) or (hanh mang)) va tong cong doan van ban*".