Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
nhung cong » dung cong, thong cong, hang cong
cong thanh » dong thanh, cong trinh, cong tan
hoc thieu » toc thieu, hoc hien
tinh cua » trinh cua, sinh cua, tinh chat
tinh va » tich va, trinh van, trinh vat
san cau » van cau, can cau, ran cau
ban cau » bang cau, ban can, van cau

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - hanh ((tinh cua) OR (tinh va)) nhung cong thanh ((san cau) OR (ban cau))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sang - hanh ((tinh cua) or (tinh va)) nhung cong thanh ((san cau) OR (ban cau))~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - hanh ((tinh cua) or (tinh va)) nhung cong thanh ((san cau) OR (ban cau))*.