Perhaps you should try some spelling variations:
khoa thien » hoan thien, thua thien, khoa than
hang khoa » dung khoa
hieu quan » hieu qua, lieu quan, thien quan
quan dinh » xuan dinh, quan binh, quan tinh
dinh toan » tinh toan, hinh toan, minh toan
ket luan » ket qua, te luan, ket doan
dat luan » dan luan, dau luan, dat quang

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

• Performing a fuzzy search may retrieve terms with similar spellings: (ngan or nganh) hang khoa luan ((ket luan) OR (dat luan)) hieu quan dinh toan khoa thien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (ngan OR nganh) hang khoa luan ((ket luan) OR (dat luan)) hieu quan dinh toan khoa thien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(ngan or nganh) hang khoa luan ((ket luan) OR (dat luan)) hieu quan dinh toan khoa thien".
• Adding a wildcard symbol may retrieve word variants: (ngan or nganh) hang khoa luan ((ket luan) OR (dat luan)) hieu quan dinh toan khoa thien*.