Perhaps you should try some spelling variations:
"nhung cau cac snippets" » "chung cu cac snippets", "nhung bai cac snippets", "nhu cau cac snippets", "nhung ca cac snippets", "nhung cuu cac snippets", "nhung cau ca snippets"
"dung java java snippets" » "dung va java snippets"
"locating bug code snippets" » "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: (((("nhung cau cac snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nhung cau cac snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nhung cau cac snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nhung cau cac snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.