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