Perhaps you should try some spelling variations:
"xuan hoang cong snippets" » "quan hoang cong snippets", "tuan hoang cong snippets", "luan hoan cong snippets", "xuan hang cong snippets", "xuan hoang long snippets", "xuan hoang vuong 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 hoang cong 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 hoang cong snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( xuan hoang cong snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("xuan hoang cong snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.