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