Perhaps you should try some spelling variations:
thanh trung » thanh tung
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
dang cong » dung cong
than cau » toan cau, phan cau, thanh chau
than cap » khan cap, thanh lap, thanh cac

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