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