Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"anh van doan snippets" » "anh van doanh snippets", "anh van toan snippets", "anh van hoan snippets", "anh va doan snippets", "thanh van doan snippets", "doanh 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: (((("anh 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: (((("anh van doan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( anh van doan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("anh van doan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.