Perhaps you should try some spelling variations:
"cong nghe sinh hoc giao trinh" » "cong nghe sinh hoc cao trinh", "cong nghe dinh hoc giao trinh", "cong nghe minh hoc giao trinh", "cong nghe tinh hoc giao trinh"
"cong nghe kinh hoc OR hinh hoc giao trinh" » "cong nghe tinh hoc OR hinh hoc giao trinh", "cong nghe tin hoc OR hinh hoc giao trinh", "cong nghe benh hoc OR hinh hoc giao trinh", "cong nghe kinh hoc OR tin hoc giao trinh", "cong nghe kinh hoc OR benh hoc giao trinh"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("cong nghe sinh hoc giao trinh") or ("cong nghe ((kinh hoc) OR (hinh hoc)) giao trinh"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("cong nghe sinh hoc giao trinh") OR ("cong nghe ((kinh hoc) OR (hinh hoc)) giao trinh")).
• Removing quotes may allow a broader search: (( cong nghe sinh hoc giao trinh ) or ( cong nghe ((kinh hoc) OR (hinh hoc)) giao trinh )).
• Adding a wildcard symbol may retrieve word variants: (("cong nghe sinh hoc giao trinh") or ("cong nghe ((kinh hoc) OR (hinh hoc)) giao trinh"))*.