Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"hoc khong do snippets" » "hoa khong do snippets", "hoc hong do snippets", "khoi khong do snippets", "hoc khong co snippets", "hoc khong lo snippets", "hoc khong de 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: (((("hoc khong do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hoc khong do snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hoc khong do snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hoc khong do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.