Perhaps you should try some spelling variations:
"cong lieu doi snippets" » "cong dieu doi snippets", "cong hieu doi snippets", "cong viec doi snippets", "cong lieu boi snippets", "cong lieu voi snippets", "cong lieu dai 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: (((("cong lieu doi snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cong lieu doi snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cong lieu doi snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong lieu doi snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.