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