Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"toan hoc de snippets" » "toan khoa de snippets", "van hoc de snippets", "hoa hoc de snippets", "toan hoc he snippets", "toan hoc te 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 de 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 de snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( toan hoc de snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("toan hoc de snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.