Perhaps you should try some spelling variations:
quang quan » quang tuan, quang uan, quan quan
trien hoat » tien hoa
tinh thong » tinh thuong, trinh thong, tinh khong
va trien » va truyen, va thiet, va tuyen
van kien » van tien, van hien, van chien
quan va » quan vi, quan ha, luan va
va kien » va lien, va dien, va 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 quang quan va trien hoat ) or ( tinh thong quan ((va kien) OR (van kien)) soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh quang quan va trien hoat ) OR ( tinh thong quan ((va kien) OR (van kien)) soat )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tinh quang quan va trien hoat ) or ( tinh thong quan ((va kien) OR (van kien)) soat ))".
• Adding a wildcard symbol may retrieve word variants: (( tinh quang quan va trien hoat ) or ( tinh thong quan ((va kien) OR (van kien)) soat ))*.