Perhaps you should try some spelling variations:
danh thanh » dinh thanh, dang thanh, nhanh thanh
nhan thong » nhan trong, nhan khong, nhan tong
khai sang » kha nang, nha sang, thai bang
nha thong » nhat thuong, nghe thong, nha truong
duong dan » duong dang, huong dan, duong van
doi khai » doi khi, toi khai, doi khang
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: doi khai sang - danh thanh ((nhan thong) or (nha thong)) duong dan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi khai sang - danh thanh ((nhan thong) OR (nha thong)) duong dan van ban*.