Perhaps you should try some spelling variations:
"te sach trinh thiet co hoc" » "te sach trinh viet co hoc", "te sach trinh thi co hoc", "te sach tranh thiet co hoc", "te hanh trinh thiet co hoc", "te sach kinh thiet co hoc", "te sach trinh nhiet co hoc", "te sach trinh thuyet co hoc", "te sach trinh nhiet cho hoc", "toc sach trinh thiet co hoc"
"thu cach thuc nhiem dai hoc" » "thu cach thuc nghiem dai hoc", "thu cach thuc hien dai hoc", "thu cach thu nghiem dai hoc", "thu anh thuc nhiem dai hoc", "thu cac thu nhiem dai hoc", "thu cach thuc nhien dai hoc", "thu cach thuc nhiem tai hoc", "thu cach thuc nghiep dai hoc", "thuc cach thuc nhiem dai hoc", "thu canh thuc nhiem dai hoc", "tu cach thuc nhiem dai hoc"

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: (("te sach trinh thiet co hoc") or ("thu cach thuc nhiem dai hoc"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("te sach trinh thiet co hoc") OR ("thu cach thuc nhiem dai hoc")).
• Removing quotes may allow a broader search: (( te sach trinh thiet co hoc ) or ( thu cach thuc nhiem dai hoc )).
• Adding a wildcard symbol may retrieve word variants: (("te sach trinh thiet co hoc") or ("thu cach thuc nhiem dai hoc"))*.