Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"kien tra do snippets" » "kiem tra do snippets", "kien tri do snippets", "kien truc do snippets", "kien tra du snippets", "kien trang do snippets", "kien trao doi 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: (((("kien tra do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("kien tra do snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( kien tra do snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("kien tra do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.