Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh luat, trinh han
tinh dung » trinh dung, tin dung, tinh quang
dung nhan » dung luan
hieu soat » hieu suat, hieu hoat, hieu luat
bien soan » bien so
nhan dan » phan dau, gian dan, nhan tai
dan hieu » danh hieu, van hieu, dao hieu
quan va » quan vi, luan va, quan ve
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: (( tinh dung nhan dan hieu soat ) or ( trinh quan ((quan va) or (quan ha)) bien soan ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh dung nhan dan hieu soat ) OR ( trinh quan ((quan va) OR (quan ha)) bien soan )).
• Adding a wildcard symbol may retrieve word variants: (( tinh dung nhan dan hieu soat ) or ( trinh quan ((quan va) or (quan ha)) bien soan ))*.