Perhaps you should try some spelling variations:
"xuan nhan con snippets" » "xuan thanh con snippets", "xuan toan con snippets", "van nhan con snippets", "xuan nhan co snippets", "xuan nhanh cong snippets", "xuan phan cong snippets"
"dung java java snippets" » "dung va java 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: (((("xuan nhan con snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("xuan nhan con snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( xuan nhan con snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("xuan nhan con snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.