Perhaps you should try some spelling variations:
"vung tra chat snippets" » "vung tra code snippets", "hung tran chat snippets", "vung thua chat snippets", "vung va chat snippets", "vung tran chau snippets", "vung tran nhat snippets", "vung hoa chat snippets"
"locating bug core snippets" » "locating bug code snippets"
"dung java java snippets" » "dung va java 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 ("vung tra chat snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("vung tra chat snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( vung tra chat snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("vung tra chat snippets"))) or ("locating bug core snippets"))*.