Perhaps you should try some spelling variations:
"trinh than duc slippers" » "trinh thanh duc slippers", "trinh han duc slippers", "trinh toan duc slippers", "trinh tran duc slippers", "trinh phan duc slippers", "trinh than doc slippers", "trinh than duc slippery", "trinh than duc 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 ("trinh than duc slippers"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("trinh than duc slippers"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( trinh than duc slippers ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("trinh than duc slippers"))) or ("locating bug code snippets"))*.