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