Perhaps you should try some spelling variations:
"cong trinh cac snippets" » "cong trinh cau snippets", "cong trinh chat snippets", "cong trinh chao snippets"
"dung dat data snippets" » "dung va data snippets", "dung tai data snippets", "dung fast data snippets", "dung dat dai snippets", "dung a data 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: (((("dung dat data snippets") or ("cong trinh cac snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung dat data snippets") OR ("cong trinh cac snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung dat data snippets ) or ( cong trinh cac snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung dat data snippets") or ("cong trinh cac snippets"))) or ("locating bug code snippets"))*.