Perhaps you should try some spelling variations:
"thuc anh 07 snippets" » "thuc hanh 07 snippets", "thuy anh 07 snippets", "thu anh 07 snippets"
"python using low slippers" » "python using low slippery", "python using low grippers"
"locating bug code snippets" » "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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"thuc anh 07 snippets\") OR (\"python using low slippers\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( thuc anh 07 snippets ) OR ( python using low slippers ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("thuc anh 07 snippets") OR ("python using low slippers"))) OR ("locating bug code snippets"))*.