Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"cong nam co snippets" » "dong nam co snippets", "uong nam co snippets", "thong nam co snippets", "cong nam cao snippets", "cong nam bo snippets", "cong nam so 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 nam co 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 nam co snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cong nam co snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong nam co snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.