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