Perhaps you should try some spelling variations:
"vu canh tranh tren" » "vu canh trinh tren", "vu canh tran tren", "vu canh tranh trong", "ve canh tranh tren", "vu anh tranh tren", "vu manh tranh tren"
"qui hoach dinh tren" » "qui hoang dinh tren", "quy hoach dinh tren", "qui hoach dinh trong", "qui hoach dinh tri", "qui hoach dinh tieu"
"vu hoach dinh dien" » "vu hoang dinh dien", "vu hoach tinh dien", "vu hoach kinh dien", "vu hoach dich dien", "quy hoach dinh dien", "thu hoach dinh dien", "ke hoach dinh dien"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("vu canh tranh tren") or ((("qui hoach dinh tren") or ("vu hoach dinh dien"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("vu canh tranh tren") OR ((("qui hoach dinh tren") OR ("vu hoach dinh dien")))).
• Removing quotes may allow a broader search: (( vu canh tranh tren ) or ((( qui hoach dinh tren ) or ( vu hoach dinh dien )))).
• Adding a wildcard symbol may retrieve word variants: (("vu canh tranh tren") or ((("qui hoach dinh tren") or ("vu hoach dinh dien"))))*.