Perhaps you should try some spelling variations:
"dung dat nghe snippets" » "dung dat code snippets", "dung va nghe snippets", "dung tai nghe snippets", "dung day nghe snippets", "dung da nghe snippets", "dung dang nghe snippets"
"locating bug core snippets" » "locating bug code snippets"
"dung trinh java snippets" » "dung tinh java snippets", "dong trinh java snippets", "cong trinh 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 trinh java snippets") or ("dung dat nghe snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung trinh java snippets") OR ("dung dat nghe snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dung trinh java snippets ) or ( dung dat nghe snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung trinh java snippets") or ("dung dat nghe snippets"))) or ("locating bug core snippets"))*.