Perhaps you should try some spelling variations:
"hang java java snippets" » "hang va java snippets"
"danh cau code snippets" » "danh dau code snippets", "danh ca code snippets", "danh hau code snippets", "danh cau cong snippets", "danh cau de snippets", "danh cfd code snippets"
"locating bug code slippers" » "locating bung code slippers", "locating bugs code slippers"

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: (((("hang java java snippets") or ("danh cau code snippets"))) or ("locating bug code slippers"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hang java java snippets") OR ("danh cau code snippets"))) OR ("locating bug code slippers")).
• Removing quotes may allow a broader search: (((( hang java java snippets ) or ( danh cau code snippets ))) or ( locating bug code slippers )).
• Adding a wildcard symbol may retrieve word variants: (((("hang java java snippets") or ("danh cau code snippets"))) or ("locating bug code slippers"))*.