Perhaps you should try some spelling variations:
khong luan » thong luan, khong quan, khung luan
tinh khong » tinh khang, tinh huong, benh khong
tinh quan » tinh quang, trinh quan, tin quan
trinh han » trinh quan
hieu soat » hieu suat, hieu hoat, hieu luat
kien soat » kiem soat, bien soan, kien hoa
van kien » van tien, van hien, van chien
lan cao » lang cao, lan cho, nang cao

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) or (trinh han)) lan cao hieu soat ) or ( tinh khong luan van kien soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((tinh quan) OR (trinh han)) lan cao hieu soat ) OR ( tinh khong luan van kien soat )).
• Adding a wildcard symbol may retrieve word variants: (( ((tinh quan) or (trinh han)) lan cao hieu soat ) or ( tinh khong luan van kien soat ))*.