Perhaps you should try some spelling variations:
"dong cao danh snippets" » "duong cao danh snippets", "dong co danh snippets", "dong cho danh snippets", "dong cao dang snippets", "dong cao anh snippets", "dong cau danh snippets", "dong cao danh slippers"
"dung va java snippets" » "dung java java snippets", "dung va java slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets", "locating bug core 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 cao danh snippets") or ("dung va java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dong cao danh snippets") OR ("dung va java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dong cao danh snippets ) or ( dung va java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong cao danh snippets") or ("dung va java snippets"))) or ("locating bug code snippets"))*.