Perhaps you should try some spelling variations:
"cong cau chap snippets" » "cong cau code snippets", "cong cu chap snippets", "cong chuc chap snippets", "thong cau chap snippets", "cong cau cham snippets", "cong cau chan snippets", "cong cau phap 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 cau chap 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 cau chap snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( cong cau chap snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong cau chap snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.