Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"moi hieu che snippets" » "moi dieu che snippets", "hoi hieu che snippets", "doi chieu che snippets", "moi hieu chi snippets", "moi hieu he 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: (((("moi hieu che snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("moi hieu che snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( moi hieu che snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("moi hieu che snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.