Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"tung pham can snippets" » "hung pham can snippets", "nhung pham can snippets", "trung phan can snippets", "tung pham van snippets", "tung pham lan snippets", "tung pham ca 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: (((("dung java java snippets") or ("tung pham can snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("tung pham can snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( tung pham can snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("tung pham can snippets"))) or ("locating bug code snippets"))*.