The UN Statistics Division has a search tool, UNdata, which is worth looking at. Drawing on 13 databases — environment, population, agriculture… but not law — UNdata provides a window on some 55 million records.
The search results are presented in a really useful format, as well. The results page offers you two tabs, Data Series and Table Presentations, that will give you documents or tables, respectively, in which your search terms appear. As well, in the Data Series tab you may choose whether to download the document, view it online, or preview it in a popup window.
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