Perhaps you should try some spelling variations:
"dung nguoi cong snippets" » "dung nguon cong snippets", "nhung nguoi cong snippets", "dung nguoi muong snippets", "dung nguoi thong snippets", "dung nguoi nung 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: (((("dung nguoi 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: (((("dung nguoi cong snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung nguoi cong snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung nguoi cong snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.