Perhaps you should try some spelling variations:
khoa thien » hoan thien, thua thien, khoa than
dat quang » dau quang, chat quang, dang quang
hang khoa » dung khoa
hieu suat » hieu luat, hieu qua
suat tinh » sat tinh, thuat tinh, quan tinh
ban hang » ngan hang
dat luan » dan luan, dau luan, bai luan
toan » tran

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

• Performing a fuzzy search may retrieve terms with similar spellings: ban hang khoa luan ((dat luan) OR (dat quang)) hieu suat tinh toan khoa thien~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ban hang khoa luan ((dat luan) OR (dat quang)) hieu suat tinh toan khoa thien".
• Adding a wildcard symbol may retrieve word variants: ban hang khoa luan ((dat luan) OR (dat quang)) hieu suat tinh toan khoa thien*.