Perhaps you should try some spelling variations:
khong thong » thong thong, khong trong, thong thuong
tieu quang » thieu quang, hieu quang, tien quang
doanh khoa » toan khoa
doanh hua » doanh cua, doanh ha, doanh luan
thong van » trong van, thong va, thong quan
van van » van ban, tan van, san van
van tai » von tai, van tuan

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu quang - hanh ((doanh hua) or (doanh khoa)) khong thong van van tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu quang - hanh ((doanh hua) OR (doanh khoa)) khong thong van van tai*.