Perhaps you should try some spelling variations:
"thu hanh trinh chao li hoc" » "thu hanh chinh chao li hoc", "thu hanh trinh chat li hoc", "thu hanh trinh han li hoc", "thu hanh trinh co li hoc", "thuc hanh trinh chao li hoc", "thu thanh trinh chao li hoc", "thuy hanh trinh chao li hoc", "thu hanh trinh hao li hoc"
"thu canh tranh nghe dien hoc" » "thu canh trinh nghe dien hoc", "thu canh anh nghe dien hoc", "thu canh hanh nghe dien hoc", "thu canh tranh nghe tieng hoc", "thu canh tranh nghe dan hoc", "thu canh tranh nghe hieu hoc", "thuc hanh tranh nghe dien hoc", "thu cong tranh nghe dien hoc", "thu ban tranh nghe dien hoc", "thu canh tranh nghe dien hoa", "thu canh tranh nghe khien hoc", "thu canh tranh nghe tin 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: (("thu hanh trinh chao li hoc") or ("thu canh tranh nghe dien hoc"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("thu hanh trinh chao li hoc") OR ("thu canh tranh nghe dien hoc")).
• Removing quotes may allow a broader search: (( thu hanh trinh chao li hoc ) or ( thu canh tranh nghe dien hoc )).
• Adding a wildcard symbol may retrieve word variants: (("thu hanh trinh chao li hoc") or ("thu canh tranh nghe dien hoc"))*.