Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"lang van son snippets" » "dang van son snippets", "tang van son snippets", "hoang van son snippets", "lang van dong snippets", "lang van cong snippets", "lang 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: (((("lang 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: (((("lang van son snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( lang van son snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("lang van son snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.