Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"xuat viet o2 snippets" » "luat viet o2 snippets", "xuan viet o2 snippets", "xuat thiet o2 snippets", "xuat viet o snippets", "xuat viet 2 snippets", "xuat viet goc 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: (((("xuat viet o2 snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("xuat viet o2 snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( xuat viet o2 snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("xuat viet o2 snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.