Perhaps you should try some spelling variations:
"thuc canh trinh thiet duoc hoc" » "thuc canh trinh viet duoc hoc", "thuc canh trinh thi duoc hoc", "thuc canh tranh thiet duoc hoc", "thuc hanh trinh thiet duoc hoc", "thuc canh tinh thiet duoc hoc", "thuc canh trinh chet duoc hoc", "thuc canh trinh hiem duoc hoc", "thuc canh trinh thuat duoc hoc", "thu canh trinh thiet duoc hoc", "thuc cach trinh thiet duoc hoc", "thuc canh trinh thiet quoc hoi"
"te sach kinh nhiem cua hoc" » "te sach kinh nghiem cua hoc", "te sach kinh hien cua hoc", "te sach binh khiem cua hoc", "te sach kinh nhiet cua hoc", "te sach kinh nhiem chuan hoc", "te sach kinh nghiep cua hoc", "toc sach kinh nhiem cua hoc", "te sach kinh nhiem cua hoi", "te sach kinh nhiem cua thuoc", "te sach kinh nhiem cua nuoc"

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