Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"chu khong de snippets" » "he khong de snippets", "thi khong de snippets", "chu trong de snippets", "chu khong he snippets", "chu khong do snippets", "chu khong ke 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: (((("chu khong 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: (((("chu khong de snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( chu khong de snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("chu khong de snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.