Perhaps you should try some spelling variations:
nhanh lang » nhanh thang, nhan dang, nhanh dong
thong cong » trong cong, tong cong, thong thong
hieu quan » hieu qua, lieu quan, thien quan
cong doan » cong dan, cong hoan, dong doanh
doan van » doan va, hoang van, luan van
ho hieu » ho chieu, hoi hieu, nho hieu

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 - ((nhanh lang) or (nhanh quang)) he thong cong doan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu quan - ((nhanh lang) OR (nhanh quang)) he thong cong doan van ban*.