Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"long van trinh slippers" » "long van thinh slippers", "long van tinh slippers", "long dan trinh slippers", "luong van trinh slippers", "song van trinh slippers", "lang van trinh slippers", "long van trinh slippery", "long van trinh grippers"
"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 java java snippets") or ("long van trinh slippers"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("long van trinh slippers"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( long van trinh slippers ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("long van trinh slippers"))) or ("locating bug code snippets"))*.