Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van phan xe snippets" » "van phong xe snippets", "van thanh xe snippets", "luan phan xe snippets", "van phan le snippets", "van phan ve snippets", "van phan ke 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: (((("van phan xe snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("van phan xe snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van phan xe snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van phan xe snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.