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