Perhaps you should try some spelling variations:
huong quan » luong quan, cuong quan, vuong quan
hieu soat » hieu suat, hieu hoat, hieu luat
tin huong » tinh huong, tin thuong, tin phuong
kien soat » kiem soat, bien soan, kien hoa
van hieu » cao hieu
quan cua » quan luan, ban cua, gian cua
cua kien » cua bien, cua vien, cuu kien
luan » lan

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 luan van hieu soat ) or ( tin huong quan cua kien soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung luan van hieu soat ) OR ( tin huong quan cua kien soat )).
• Adding a wildcard symbol may retrieve word variants: (( tin dung luan van hieu soat ) or ( tin huong quan cua kien soat ))*.