Perhaps you should try some spelling variations:
"hoc tran trong slippers" » "hoc gian trong slippers", "hoc quan trong slippers", "hoc tan trong slippers", "hoc tren trong slippers", "boc tran trong slippers", "hoc tran trong slippery", "hoc tran 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"

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 ("hoc tran trong slippers"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("hoc tran trong slippers"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( hoc tran trong slippers ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("hoc tran trong slippers"))) or ("locating bug code snippets"))*.