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