Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"wei tuan do snippets" » "wei tan do snippets", "le tuan do snippets", "tri tuan do snippets", "wei toan do snippets", "wei truan doi snippets", "wei quan doi 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: (((("wei tuan 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: (((("wei tuan do snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( wei tuan do snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("wei tuan do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.