Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
nhung cong » dung cong, thong cong, hang cong
hoc thieu » toc thieu, hoc hien
trung cua » truong cua, trung tuan, trung cap
tranh cua » doanh cua, manh cua
cong tac » cong ty
toan cau » toan cao, toan tap, toan tai
toan ban » van ban

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 cua) or (tranh cua)) nhung cong tac ((toan cau) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - hanh ((trung cua) OR (tranh cua)) nhung cong tac ((toan cau) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - hanh ((trung cua) or (tranh cua)) nhung cong tac ((toan cau) or (toan ban))*.