Perhaps you should try some spelling variations:
"python using pre snippets" » "python nursing pre snippets", "python using one snippets", "python using ph snippets"
"tri chi dan snippets" » "tai chi dan snippets", "tri nhi dan snippets", "trien chi dan snippets", "tri choi dan snippets", "tri chi van snippets", "tri thi dan snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("python using pre snippets") OR ("tri chi dan snippets"))) OR ("locating bug code snippets"))~.
• Removing quotes may allow a broader search: (((( python using pre snippets ) or ( tri chi dan snippets ))) or ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("python using pre snippets") or ("tri chi dan snippets"))) or ("locating bug code snippets"))*.