Perhaps you should try some spelling variations:
"dung phan hoan snippets" » "dung phan code snippets", "dung nhan hoan snippets", "dung luan hoan snippets", "dung ha hoan snippets", "dung phap hoan snippets", "dung phan hoa snippets", "dung pham hoang snippets"
"locating bug core snippets" » "locating bug code snippets"
"dang java java snippets" » "dang va java 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: (((("dang java java snippets") or ("dung phan hoan snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dang java java snippets") OR ("dung phan hoan snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dang java java snippets ) or ( dung phan hoan snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dang java java snippets") or ("dung phan hoan snippets"))) or ("locating bug core snippets"))*.