Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"van hanh cat snippets" » "van thanh cat snippets", "ban hanh cat snippets", "van anh cat snippets", "van hanh cac snippets", "van hanh luat snippets", "van nhanh cay 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: (((("van hanh cat snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("van hanh cat snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van hanh cat snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van hanh cat snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.