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