What tools can be used to parse and download .doc / .pdf / .xls documents from a certain set of domains?

Question

Google

Colleagues, please help - the next task is to download documents from a certain set of domains.
First of all, I remember metagoofil - for some reason it did not give me a single result
goofile - similarly without results
(it seems to me there is some kind of general problem, but I don’t know which way to think)
searchdiggity - in the process of searching for Russian-language documentation,
what could be the problem with the above scripts
, what other means are there to solve my problem?