Perhaps you should try some spelling variations:
"dang java java snippets" » "dang va java snippets", "dang java java slippers"
"dung khoa than snippets" » "dung cho than snippets", "dung khoa luan snippets", "dung hoa thai snippets", "dung hoa tan snippets", "dung khoa than 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: (((("dang java java snippets") or ("dung khoa than snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dang java java snippets") OR ("dung khoa than snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dang java java snippets ) or ( dung khoa than snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dang java java snippets") or ("dung khoa than snippets"))) or ("locating bug code snippets"))*.