Perhaps you should try some spelling variations:
"cong trinh trac snippets" » "cong trinh trang snippets", "cong trinh toan snippets", "cong trinh tai snippets", "cong trinh trac slippers"
"ung dung code snippets" » "ung dung cong snippets", "ung dung co snippets", "ung dung de snippets", "cung dcung code snippets", "ung dung code slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code 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: (((("ung dung code snippets") or ("cong trinh trac snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("ung dung code snippets") OR ("cong trinh trac snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( ung dung code snippets ) or ( cong trinh trac snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("ung dung code snippets") or ("cong trinh trac snippets"))) or ("locating bug code snippets"))*.