Perhaps you should try some spelling variations:
"thuc canh tranh thiet duoc hoc" » "thuc canh trinh thiet duoc hoc", "thuc canh trang thiet duoc hoc", "thuc canh toan thiet duoc hoc", "thuc canh tranh chet duoc hoc", "thuc canh tranh hiem duoc hoc", "thuc canh tranh thuat duoc hoc", "thuc hanh tranh thiet duoc hoc", "thu canh tranh thiet duoc hoc", "thuc cach tranh thiet duoc hoc", "thuc canh tranh 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 tranh 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 tranh thiet duoc hoc") OR ("te sach kinh nhiem cua hoc")).
• Removing quotes may allow a broader search: (( thuc canh tranh thiet duoc hoc ) or ( te sach kinh nhiem cua hoc )).
• Adding a wildcard symbol may retrieve word variants: (("thuc canh tranh thiet duoc hoc") or ("te sach kinh nhiem cua hoc"))*.