Perhaps you should try some spelling variations:
nhanh mang » nhanh lang, hanh mang, nhanh quang
hieu quan » hieu qua, lieu quan, thien quan
qua trong » quan trong, qua trinh, qua song
dua trong » da trong, dia trong, du trong
cong doan » cong dan, cong hoan, dong doanh
nha hieu » nha dieu, nghe hieu, phan hieu
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: nha hieu quan - nhanh mang ((qua trong) or (dua trong)) cong doan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nha hieu quan - nhanh mang ((qua trong) OR (dua trong)) cong doan van ban*.