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