Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"gian hieu do snippets" » "gian viet do snippets", "van hieu do snippets", "tin hieu do snippets", "gian hieu so snippets", "gian hieu bo snippets", "gian bieu do 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: (((("gian hieu 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: (((("gian hieu do snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( gian hieu do snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("gian hieu do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.