Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"quoc cao hop snippets" » "quoc bao hop snippets", "quoc cac hop snippets", "quoc cho hop snippets", "quoc cao hoc snippets", "quoc cao hon 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: (((("quoc cao hop snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("quoc cao hop snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( quoc cao hop snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("quoc cao hop snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.