Perhaps you should try some spelling variations:
"dung hanh nghe snippets" » "dung hanh code snippets", "dung thanh nghe snippets", "dang hanh nghe snippets", "dung danh nghe snippets", "dung anh nghe snippets", "dung van nghe snippets", "dung lang nghe 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 hanh nghe 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 hanh nghe snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dung hanh nghe snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung hanh nghe snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.