Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"doi thieu ve snippets" » "doi chieu ve snippets", "gioi thieu ve snippets", "toc thieu ve snippets", "doi hieu ve snippets", "doi thiet ke snippets", "doi thieu so 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: (((("doi thieu ve snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("doi thieu ve snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( doi thieu ve snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("doi thieu ve snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.