Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu sang » chieu sang, thieu khang, thieu quang
cong thanh » dong thanh, cong tan, truong thanh
hoc thieu » toc thieu, hoc hien
trung cua » truong cua, trung tuan, trung cap
cua dung » cua dang, cua dong, qua dung
san cau » van cau, ban cau, can cau

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