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