Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"tro viet cho snippets" » "tho viet cho snippets", "ro viet cho snippets", "so viet cho snippets", "tro viec cho snippets", "tro viet co snippets", "tro viet theo 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: (((("tro viet cho snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tro viet cho snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tro viet cho snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tro viet cho snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.