Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"dan khanh de snippets" » "dang khanh de snippets", "van khanh de snippets", "dat khanh de snippets", "dan hanh de snippets", "dan thanh de snippets", "dan khach deu 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: (((("dan khanh de snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dan khanh de snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dan khanh de snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dan khanh de snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.