Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"hieu dac cua snippets" » "hieu cac cua snippets", "bieu dac cua snippets", "chieu day cua snippets", "hieu dai cua snippets", "hieu day cua snippets", "hieu tac cua 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: (((("hieu dac cua snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hieu dac cua snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hieu dac cua snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hieu dac cua snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.