Perhaps you should try some spelling variations:
nnhanh lang » nhan lang, nhanh mang
nhanh lang » nhanh quang, nhanh thang, nhan dang
hieu tinh » chieu tinh, lieu tinh, kieu tinh
hang cong » dang cong, hang nong, thanh cong
bang cong » dang cong, bang song, dung cong
doc hieu » toc thieu, hoc thieu, hoc hien
dan van » dang van, doan van, dao van

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu tinh - ((nhanh lang) or (nnhanh lang)) cua ((hang cong) or (bang cong)) dan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu tinh - ((nhanh lang) OR (nnhanh lang)) cua ((hang cong) OR (bang cong)) dan van ban.
• Adding a wildcard symbol may retrieve word variants: doc hieu tinh - ((nhanh lang) or (nnhanh lang)) cua ((hang cong) or (bang cong)) dan van ban*.