Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"van hanh thin slippers" » "van hanh tin slippers", "van canh thin slippers", "van danh thin slippers", "van thanh thin slippers", "ban hanh thin slippers", "van anh thin slippers", "van hanh thin slippery", "van hanh thin 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 ("van hanh thin slippers"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("van hanh thin slippers"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( van hanh thin slippers ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("van hanh thin slippers"))) or ("locating bug code snippets"))*.