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