Perhaps you should try some spelling variations:
"trinh quan luan van kien soat" » "tinh quang luan van kien soat", "trinh luat luan van kien soat", "trinh han luan van kien soat", "trinh quan luan van kiem soat", "trinh quan luan van bien soan", "trinh quan luan van kien hoa", "trinh quan luan van tien soat", "trinh quan luan van hien soat", "trinh quan luan van chien soat", "trinh quan lan van kien soat"
"minh tuan tan van hieu thuat" » "minh tuan tan van lieu thuat", "minh tuan tan van thien thuat", "minh tuan tan van chien thuat", "anh tuan tan van hieu thuat", "minh tran tan van hieu thuat", "minh xuan tan van hieu thuat", "minh tuan tai van hieu thuat", "minh tuan tan cao hieu thuat", "minh tuan tran van hieu thuat", "minh tuan tang van hieu thuat", "minh tuan dang van hieu thuat"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("trinh quan luan van kien soat") or ("minh tuan tan van hieu thuat"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("trinh quan luan van kien soat") OR ("minh tuan tan van hieu thuat")).
• Removing quotes may allow a broader search: (( trinh quan luan van kien soat ) or ( minh tuan tan van hieu thuat )).
• Adding a wildcard symbol may retrieve word variants: (("trinh quan luan van kien soat") or ("minh tuan tan van hieu thuat"))*.