Perhaps you should try some spelling variations:
tinh luong » tinh huong, dinh luong, minh luong
hieu luat » hieu qua
dung tan » dung toan, duong tan, dung tai
van kiem » va kiem, van kien, van hieu
quan han » quan hanh, quanh han, quan hai
tan van » tran van, tang van, luan van
quan ha » quan he

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tin dung tan van kiem tra ) or ( tinh luong ((quan han) or (quan ha)) hieu luat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung tan van kiem tra ) OR ( tinh luong ((quan han) OR (quan ha)) hieu luat )).
• Adding a wildcard symbol may retrieve word variants: (( tin dung tan van kiem tra ) or ( tinh luong ((quan han) or (quan ha)) hieu luat ))*.