Perhaps you should try some spelling variations:
"nha hoc sach grippers" » "nha hoc soft grippers", "nha hoc sinh grippers", "nha hoc cac grippers", "nha hoc anh grippers", "nha thuoc sach grippers", "khoa hoc sach grippers", "nha nuoc sach grippers"
"python using data snippets" » "python using java snippets", "python using sat snippets", "python missing data snippets", "python using data slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("nha hoc sach grippers") or ("python using data snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nha hoc sach grippers") OR ("python using data snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nha hoc sach grippers ) or ( python using data snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nha hoc sach grippers") or ("python using data snippets"))) or ("locating bug code snippets"))*.