Perhaps you should try some spelling variations:
"doanh qua trinh slippers" » "doanh quan trinh slippers", "doanh cua trinh slippers", "danh qua trinh slippers", "doanh qua kinh slippers", "doanh qua trinh slippery", "doanh qua 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: (((("doanh qua 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: (((("doanh qua trinh slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( doanh qua trinh slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("doanh qua trinh slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.