Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"luc van hoan snippets" » "luc van hoang snippets", "luc van hoa snippets", "luc van toan snippets", "luoc van hoan snippets", "luu van hoan snippets", "duc van hoan 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: (((("luc van 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: (((("luc van hoan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( luc van hoan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("luc van hoan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.