Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"phi luan so snippets" » "thi luan so snippets", "phi quan so snippets", "phap luan so snippets", "phi luat so snippets", "phi luan san 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: (((("phi luan so snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("phi luan so snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( phi luan so snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("phi luan so snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.