Perhaps you should try some spelling variations:
"dung viet cham snippets" » "dung viet code snippets", "nang viet cham snippets", "cong viet cham snippets", "mang viet cham snippets", "dung viet nam snippets", "dung viet ha snippets", "dung viet phan 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 viet cham snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung viet cham snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dung viet cham snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung viet cham snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.