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