Perhaps you should try some spelling variations:
"trinh phan van slippers" » "trinh han van slippers", "trinh quan van slippers", "thanh phan van slippers", "trinh pham van slippers", "trinh thanh van slippers", "trinh luan van slippers", "trinh phan van slippery", "trinh phan van 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 phan van 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 phan van slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh phan van slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh phan van slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.