Perhaps you should try some spelling variations:
"dung tren hanh slippers" » "dung trong hanh slippers", "dung trung hanh slippers", "dung tien hanh slippers", "dung tran hanh slippers", "dung tren lanh slippers", "dung tren hanh slippery", "dung tren hanh 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: (((("dung tren hanh slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung tren hanh slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung tren hanh slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung tren hanh slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.