Perhaps you should try some spelling variations:
"cong sang cho snippets" » "cong san cho snippets", "cong lang cho snippets", "cong vang cho snippets", "cong danh cho snippets", "cong dung cho snippets", "cong sang tao snippets"
"dung java java snippets" » "dung va java snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core 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 sang cho snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cong sang cho snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cong sang cho snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong sang cho snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.