Perhaps you should try some spelling variations:
"tu canh tranh nghien bai hoc" » "tu canh trinh nghien bai hoc", "tu canh tron nghien bai hoc", "tu canh trong nghien bai hoc", "tu canh tranh nghiep bai hoc", "tu canh tranh nghiep tai hoc", "tu canh tranh nghiep bao hoc", "thu canh tranh nghien bai hoc", "tu chanh tranh nghien bai hoc", "tu can tranh nghien bai hoc", "tu canh tranh nghien dai hoc"
"tu lanh day nghiep va hoc" » "tu lanh lam nghiep va hoc", "tu lanh cac nghiep va hoc", "tu lanh dau nghien va hoc", "tu lanh day nghiep vu hoc", "tu lanh dao nghiep va hoc", "tu lanh lay nghiep va hoc", "tu danh dau nghiep va hoc", "tu hanh day nghiep va hoc", "tu lenh day nghiep va hoc", "tu manh day nghiep va hoc", "tu lanh day nghiep van 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: (("tu canh tranh nghien bai hoc") or ("tu lanh day nghiep va hoc"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("tu canh tranh nghien bai hoc") OR ("tu lanh day nghiep va hoc")).
• Removing quotes may allow a broader search: (( tu canh tranh nghien bai hoc ) or ( tu lanh day nghiep va hoc )).
• Adding a wildcard symbol may retrieve word variants: (("tu canh tranh nghien bai hoc") or ("tu lanh day nghiep va hoc"))*.