Perhaps you should try some spelling variations:
tinh quan » tinh quang, trinh quan, tin quan
quan quan » quan quang, qua quan, quan luan
quan dinh » xuan dinh, quan binh, quan tinh
dien soat » dien hoat, dien hoa, bien soan
dung quan » dung quang, dung luan, luong quan
kiem soat » kiem toan
bien so » bien doi
he kiem » de kiem, ke kiem, ve kiem

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tinh quan quan dinh ((dien soat) or (bien so)) ) or ( trinh dung quan he kiem soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh quan quan dinh ((dien soat) OR (bien so)) ) OR ( trinh dung quan he kiem soat )).
• Adding a wildcard symbol may retrieve word variants: (( tinh quan quan dinh ((dien soat) or (bien so)) ) or ( trinh dung quan he kiem soat ))*.