Perhaps you should try some spelling variations:
"thi lan hoc snippets" » "thi hanh hoc snippets", "thi nang hoc snippets", "thi lien hoc snippets", "thi luan hoc snippets", "thi van hoc snippets", "thi dan hoc snippets"
"python using a slippers" » "python using a slippery", "python using a grippers"
"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: (((("thi lan hoc snippets") OR ("python using a slippers"))) OR ("locating bug code snippets"))~.
• Removing quotes may allow a broader search: (((( thi lan hoc snippets ) or ( python using a slippers ))) or ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("thi lan hoc snippets") or ("python using a slippers"))) or ("locating bug code snippets"))*.