Perhaps you should try some spelling variations:
"dao vung chat snippets" » "dao vung code snippets", "dao dung chat snippets", "dao vung chac snippets", "dao luong chat snippets", "dan vung chat snippets", "dao cuong chat snippets", "dao van 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 ("dao vung 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 ("dao vung chat snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( dao vung chat snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("dao vung chat snippets"))) or ("locating bug core snippets"))*.