Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"nan dac cho snippets" » "ban dac cho snippets", "tan dac cho snippets", "lan dac cho snippets", "nan day cho snippets", "nan danh cho 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: (((("nan dac cho snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nan dac cho snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nan dac cho snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nan dac cho snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.