Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
trung quan » truong quan, trong quan, truong quang
trung tuan » trung thanh, trung tam, tran tuan
nhung cong » dung cong, thong cong, hang cong
hoc thieu » toc thieu, hoc hien
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu sang - hanh ((trung quan) or (trung tuan)) nhung cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - hanh ((trung quan) OR (trung tuan)) nhung cong tac toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - hanh ((trung quan) or (trung tuan)) nhung cong tac toan cau*.