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