Perhaps you should try some spelling variations:
khong thong » thong thong, khong trong, thong thuong
hieu quang » thieu quang, hieu quan, hieu qua
doanh luan » doanh nhan
theo hieu » theo chieu, theo tieu, thien hieu
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 hieu quang - hanh ((doanh cua) or (doanh luan)) khong thong van van tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo hieu quang - hanh ((doanh cua) OR (doanh luan)) khong thong van van tai*.