Perhaps you should try some spelling variations:
"bi trinh su grippers" » "bi trinh soft grippers", "bi tinh su grippers", "qui trinh su grippers", "thi trinh su grippers", "bi trinh tu grippers", "bi trinh san grippers", "bi trinh cau grippers"
"python using java slippers" » "python using data slippers", "python using java slippery"
"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: "((((\"python using java slippers\") OR (\"bi trinh su grippers\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( python using java slippers ) OR ( bi trinh su grippers ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("python using java slippers") OR ("bi trinh su grippers"))) OR ("locating bug code snippets"))*.