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