Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"cong goi deu snippets" » "cong noi deu snippets", "cong soi deu snippets", "dong goi deu snippets", "cong doi deu snippets", "cong goi dau snippets", "cong moi dieu 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 goi deu snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cong goi deu snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cong goi deu snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong goi deu snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.