Perhaps you should try some spelling variations:
"dung khoan viet snippets" » "dung khoa viet snippets", "chung khoan viet snippets", "tung khoanh viet snippets", "dung hoa viet snippets", "dung thon viet snippets", "dung han viet snippets", "dung khoan viet slippers"
"hanh java java snippets" » "hanh va java snippets", "hanh 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: (((("hanh java java snippets") or ("dung khoan viet snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hanh java java snippets") OR ("dung khoan viet snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hanh java java snippets ) or ( dung khoan viet snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hanh java java snippets") or ("dung khoan viet snippets"))) or ("locating bug code snippets"))*.