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