Perhaps you should try some spelling variations:
"khanh vinh cuu snippets" » "thanh vinh cuu snippets", "khanh linh cuu snippets", "thanh binh cuu snippets", "khanh dinh cuu snippets", "khanh sinh cua snippets", "khanh dinh cu snippets"
"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: (((("khanh vinh cuu snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("khanh vinh cuu snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khanh vinh cuu snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khanh vinh cuu snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.