Perhaps you should try some spelling variations:
"dang van trinh slippers" » "dang van thinh slippers", "dang van tinh slippers", "dang dan trinh slippers", "hoang van trinh slippers", "hang va trinh slippers", "dang van trinh slippery", "dang van 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: (((("dang van 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: (((("dang van trinh slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dang van trinh slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dang van trinh slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.