Perhaps you should try some spelling variations:
"dan think java snippets" » "dan trinh java snippets", "dan thi java snippets", "van thinh java snippets", "dan than java snippets"
"dung luan de snippets" » "dung luan den snippets", "dung luan ve snippets", "dung luat de 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 luan de snippets") or ("dan think java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung luan de snippets") OR ("dan think java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung luan de snippets ) or ( dan think java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung luan de snippets") or ("dan think java snippets"))) or ("locating bug code snippets"))*.