Perhaps you should try some spelling variations:
"dung cao cong snippets" » "dung cao code snippets", "duong cao cong snippets", "dung cho cong snippets", "dung co cong snippets", "dung cac cong snippets", "dung cao dang snippets", "dung cua cong 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 cao cong 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 cao cong snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dung cao cong snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung cao cong snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.