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