Perhaps you should try some spelling variations:
"trinh cong dac slippers" » "trinh dung dac slippers", "trinh cong tac slippers", "trinh cong dan slippers", "trinh cong cac slippers", "trinh cong dac slippery", "trinh cong dac 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 cong dac 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 cong dac slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh cong dac slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh cong dac slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.