1.Try search using a search term that includes "inurl: pdf" in the end or "intitle: pdf" .
尝试搜索使用的搜索字词,包括放置“inurl:PDF格式”在年底或“标题:PDF格式”。
2.The Boolean operators intitle and inurl work in Google directory, as does OR.
intitle和inurl这样的布尔运算符像OR一样在GoogleDirectory中同样适用。