Perhaps you should try some spelling variations:
"cong lang cong snippets" » "cong lang code snippets", "cong vang cong snippets", "cong luong cong snippets", "cong quang cong snippets", "cong dang cong snippets", "cong hang cong snippets", "cong bang 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: (((("cong lang 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: (((("cong lang cong snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( cong lang cong snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong lang cong snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.