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