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