Perhaps you should try some spelling variations:
"trinh toan trac slippers" » "tinh toan trac slippers", "thanh toan trac slippers", "trinh han trac slippers", "trinh toan tran slippers", "trinh thoan tran slippers", "trinh toan tap slippers", "trinh toan trac slippery", "trinh toan trac 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 toan trac 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 toan trac slippers"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( trinh toan trac slippers ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("trinh toan trac slippers"))) or ("locating bug code snippets"))*.