Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van hanh dot snippets" » "van thanh dot snippets", "ban hanh dot snippets", "van anh dot snippets", "van hanh tot snippets", "van hanh mot snippets", "van hanh dong 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: (((("python using java snippets") or ("van hanh dot snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("python using java snippets") OR ("van hanh dot snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( python using java snippets ) or ( van hanh dot snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("python using java snippets") or ("van hanh dot snippets"))) or ("locating bug code snippets"))*.