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