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