Perhaps you should try some spelling variations:
"dung long tong snippets" » "dung long code snippets", "dung luong tong snippets", "dung cong tong snippets", "dung dong tong snippets", "dung luong trong snippets", "dung cong trong snippets", "dung dong thong snippets"
"locating bug core snippets" » "locating bug code snippets"
"dung java java snippets" » "dung 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: (((("dung long tong snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung long tong snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dung long tong snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung long tong snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.