Perhaps you should try some spelling variations:
"van khuc danh snippets" » "van chuc danh snippets", "van thuc hanh snippets", "van thuc dan snippets", "van phuc danh snippets", "van thuc danh snippets", "van phuoc danh snippets", "van khuc danh slippers"
"dung java java snippets" » "dung va java snippets", "dung java 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: (((("van khuc danh snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("van khuc danh snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van khuc danh snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van khuc danh snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.