Perhaps you should try some spelling variations:
"cong cac cach snippets" » "cong cac code snippets", "cuong cac cach snippets", "cong tac cach snippets", "cong cau cach snippets", "cong cai cach snippets", "cong cuoc cach snippets", "cong va cach 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 cac cach 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 cac cach snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( cong cac cach snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong cac cach snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.