Perhaps you should try some spelling variations:
"dang tinh cong snippets" » "dang dinh cong snippets", "dang sinh cong snippets", "dang vinh cong snippets", "dang trinh cong snippets", "dang tinh cuong snippets", "dang minh cong snippets"
"dung java java snippets" » "dung va java 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: (((("dang tinh cong snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dang tinh cong snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dang tinh cong snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dang tinh cong snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.