Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"viec dan cac snippets" » "viec dang cac snippets", "viec ban cac snippets", "viec dat cac snippets", "viec dan cach snippets", "viec dan ca 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: (((("viec dan cac snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("viec dan cac snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( viec dan cac snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("viec dan cac snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.