Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khu doan du snippets" » "kieu doan du snippets", "khu do du snippets", "thi doan du snippets", "khu doan dau snippets", "khu toan du snippets", "khu doan do 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: (((("khu doan du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("khu doan du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khu doan du snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khu doan du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.