Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"phan van tre snippets" » "pham van tre snippets", "thanh van tre snippets", "luan van tre snippets", "phan van tren snippets", "phan van te snippets", "phan ban tre 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 tre 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 tre snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( phan van tre snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("phan van tre snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.