Perhaps you should try some spelling variations:
nhanh thang » nhanh thanh, nhanh quang, hanh trang
hieu quang » thieu quang, hieu quan, hieu qua
nhanh lang » nhanh quang, nhan dang, nhanh dong
thong doan » thong dan, trong doanh, thong hoang
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 quang - ((nhanh lang) or (nhanh thang)) he thong thong doan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu quang - ((nhanh lang) OR (nhanh thang)) he thong thong doan van ban*.