Perhaps you should try some spelling variations:
"dung nguon java snippets" » "dung nguoi java snippets", "luong nguon java snippets", "dung ngan java snippets", "dung ngu java snippets"
"locating bug core snippets" » "locating bug code snippets"
"dung co code snippets" » "dung cho code snippets", "dung cong code snippets", "dung cua code snippets", "dung cfd 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: (((("dung nguon java snippets") or ("dung co code snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung nguon java snippets") OR ("dung co code snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dung nguon java snippets ) or ( dung co code snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung nguon java snippets") or ("dung co code snippets"))) or ("locating bug core snippets"))*.