Baidu search, how to filter ads
intitle: Chongqing inurl:edu filetype:pdf 2018…2022
Meaning: search for education-related pdf files in Chongqing from 2018 to 2022,
pay attention to spaces
The effect is as follows:
explain
The intitle keyword is in the title, such as intitle: e-commerce development
inurl link is designated as education network
com 商业组织和公司
net 网络服务商
gov 政府部门
org 非盈利性组织
int 国际组织
edu 教育部门
filetype is specified as the document type of pdf
time plus two points interval, specify the time range