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