Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"dan hoc tre snippets" » "van hoc tre snippets", "dan toc tre snippets", "dai hoc tre snippets", "dan hoc tren snippets", "dan hoc te snippets", "dan soc tre 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: (((("dan hoc tre snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dan hoc tre snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dan hoc tre snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dan hoc tre snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.