Perhaps you should try some spelling variations:
"han viet trong slippers" » "han viet trung slippers", "han viet thong slippers", "han viet huong slippers", "san viet trong slippers", "van viet trong slippers", "dan viet trong slippers", "han viet trong slippery", "han 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: (((("han 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: (((("han viet trong slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( han viet trong slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("han viet trong slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.