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