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