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