Perhaps you should try some spelling variations:
"thuc hanh trinh nghe di hoc" » "thuc hanh chinh nghe di hoc", "thuc hanh trinh nghien di hoc", "thuc hanh trinh he di hoc", "thuc hanh trinh nha di hoc", "thuc hanh trinh nghe vi hoc", "thuc hanh trinh nghe dien hoc", "thuc hanh trinh nghe dan hoc", "thuc hanh trinh nghe dai hoc", "thuc hanh trinh nghe dia hoc", "thuc hanh trinh nghe li hoc", "thu hanh trinh nghe di hoc"
"tu canh tranh thi dau hoc" » "tu canh tranh thai dau hoc", "tu canh tran thi dau hoc", "tu canh trinh thi dau hoc", "thu canh tranh thi dau hoc", "tu chanh tranh thi dau hoc", "tu can tranh thi dau hoc", "tu canh tranh thi dai hoc", "tu canh tranh phi dau hoc", "tu canh tranh thi dan hoc", "tu canh tranh thi du 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: (("thuc hanh trinh nghe di hoc") or ("tu canh tranh thi dau hoc"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("thuc hanh trinh nghe di hoc") OR ("tu canh tranh thi dau hoc")).
• Removing quotes may allow a broader search: (( thuc hanh trinh nghe di hoc ) or ( tu canh tranh thi dau hoc )).
• Adding a wildcard symbol may retrieve word variants: (("thuc hanh trinh nghe di hoc") or ("tu canh tranh thi dau hoc"))*.