Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"phan cac core snippets" » "nhan cach core snippets", "phan dau core snippets", "phan lap core snippets", "phan cac cong snippets", "phan cac co snippets", "phan cac che snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code 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: (((("phan cac core snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("phan cac core snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( phan cac core snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("phan cac core snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.