Perhaps you should try some spelling variations:
"dong doanh den snippets" » "dung doanh den snippets", "trong doanh den snippets", "doanh doanh den snippets", "dong doanh tien snippets", "dong doanh tren snippets", "dong doanh vien 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: (((("dong doanh den snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dong doanh den snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dong doanh den snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong doanh den snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.