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