Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"cay van doan snippets" » "cay van doanh snippets", "cay van toan snippets", "cay van hoan snippets", "cac van doan snippets", "cao van doan snippets", "can 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: (((("cay 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: (((("cay van doan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cay van doan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cay van doan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.