Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"toan hoc don snippets" » "toan khoa don snippets", "van hoc don snippets", "hoa hoc don snippets", "toan hoc dong snippets", "toan hoc dan snippets", "toan hoc do snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("toan hoc don snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("toan hoc don snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( toan hoc don snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("toan hoc don snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.