Perhaps you should try some spelling variations:
"doc hieu data snippets" » "doc lieu data snippets", "doc bieu dat snippets", "doc hieu bat snippets", "toc thieu data snippets", "hoc thieu data snippets", "hoc hien data snippets"
"dung cac cong snippets" » "luong cac cong snippets", "dung cho cong snippets", "dung tai cong snippets", "dung cua cong 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 cac cong snippets") or ("doc hieu data snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung cac cong snippets") OR ("doc hieu data snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung cac cong snippets ) or ( doc hieu data snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung cac cong snippets") or ("doc hieu data snippets"))) or ("locating bug code snippets"))*.