This Link does not exist in your language, View in: English (en),
Or use Google Translate:  
বাংলা (bn) | Change Language (Change Language)

https://dec.usaid.gov/dec/home/Default.aspx

The Development Experience Clearinghouse (DEC) is the largest online resource for USAID funded technical and project materials for international development, with assets dating back to 1945. You are able to access information on over 190,000 USAID technical and program documents with more than 155,500 available for electronic download and growing everyday.

The purpose of the DEC is to strengthen USAID's development projects, activities, and programs by making these development experience documents available to USAID offices and mission staff, PVO's, NGO's, universities and research institutions, developing countries, and the public worldwide.