Perhaps you should try some spelling variations:
quang thuong » quang phuong, quang truong, quang thong
thuat mach » thuat sach, thuat tach, thuyet mach
doanh phan » doanh nhan, doan phan, doanh thanh
hoc thuat » hoc thuyet, hoc thuc, hoc chat
dat quang » dau quang, chat quang, dang quang
cong dat » cong dan, dong dat, cong da
dan phan » doan phan, dan chan, van phan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thuat mach - thanh cong dat quang thuong ((dan phan) or (doanh phan)) lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thuat mach - thanh cong dat quang thuong ((dan phan) OR (doanh phan)) lap*.