Perhaps you should try some spelling variations:
"dung vinh cach snippets" » "dung vinh code snippets", "dang vinh cach snippets", "dung ninh cach snippets", "quang vinh cach snippets", "dung tinh cach snippets", "dung minh cach snippets", "dung dinh cac 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 vinh cach 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 vinh cach snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dung vinh cach snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung vinh cach snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.