Perhaps you should try some spelling variations:
"dong danh canh snippets" » "dong danh code snippets", "dong doanh canh snippets", "dong anh canh snippets", "cong danh canh snippets", "dong dan canh snippets", "dong danh thanh snippets", "dong dang hanh 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: (((("dong danh canh snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dong danh canh snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dong danh canh snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong danh canh snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.