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