Perhaps you should try some spelling variations:
nhanh mang » nhanh lang, hanh mang, nhanh quang
xuat thong » xuat thuong, suat thong, luat thuong
thong cong » trong cong, tong cong, thong thong
hieu quan » lieu quan, thien quan, lien quan
mang xuat » hang xuat, san xuat, nang suat
cong doan » cong dan, cong hoan, dong doanh
doan van » doan va, hoang van, luan 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 quan) or (hieu qua)) - nhanh mang xuat thong cong doan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu quan) OR (hieu qua)) - nhanh mang xuat thong cong doan van ban*.