Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"cong viet can snippets" » "cong viet code snippets", "cong viec can snippets", "thong viet can snippets", "nang viet can snippets", "cong viet van snippets", "cong viet ca snippets", "cong vien can snippets"
"dung java java snippets" » "dung va java 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: (((("cong viet can snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cong viet can snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( cong viet can snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong viet can snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.