Perhaps you should try some spelling variations:
"doanh doanh cho snippets" » "toan doanh cho snippets", "doanh hoan cho snippets", "doanh thanh cho snippets", "doanh danh cho snippets", "doanh doanh co snippets", "doanh doanh cao 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: (((("doanh doanh cho snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("doanh doanh cho snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( doanh doanh cho snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("doanh doanh cho snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.