Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"tong duc long snippets" » "tong cuc long snippets", "hong duc long snippets", "ton duc long snippets", "tong duc cong snippets", "tong duc dong snippets", "tong duc hong 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: (((("tong duc long snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tong duc long snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tong duc long snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tong duc long snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.