Perhaps you should try some spelling variations:
"cong kha trinh slippers" » "cong qua trinh slippers", "cong ha tinh slippers", "cong tra trinh slippers", "cong khan trinh slippers", "cong ha trinh slippers", "cong khi trinh slippers", "cong kha trinh slippery", "cong kha 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: (((("cong kha 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: (((("cong kha trinh slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cong kha trinh slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong kha trinh slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.