Perhaps you should try some spelling variations:
"dung thanh chap snippets" » "dong thanh chap snippets", "dang thanh chap snippets", "dung thang chap snippets", "dung tranh chap snippets", "dung thanh cha snippets", "dung thanh cham snippets"
"dung java java snippets" » "dung va java 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 thanh chap snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung thanh chap snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung thanh chap snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung thanh chap snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.