Perhaps you should try some spelling variations:
"cong viet data snippets" » "cong viet dat snippets", "cong viet ta snippets", "cong lieu data snippets", "cong viec data snippets", "thong viet data snippets", "nang viet data snippets", "cong viet data slippers"
"dung cho code snippets" » "dung cho cong snippets", "dung cfd code snippets", "dung cho con snippets", "dung cho 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: (((("dung cho code snippets") or ("cong viet data snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung cho code snippets") OR ("cong viet data snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung cho code snippets ) or ( cong viet data snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung cho code snippets") or ("cong viet data snippets"))) or ("locating bug code snippets"))*.