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
tranh va » tranh van, trang va, thanh va
trinh va » trinh van, trinh vat, trinh ve
cong san » cong tac
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban

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 - canh ((tranh va) OR (trinh va)) nhung cong san ((toan cau) OR (toan tap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sang - canh ((tranh va) OR (trinh va)) nhung cong san ((toan cau) or (toan tap))~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - canh ((tranh va) OR (trinh va)) nhung cong san ((toan cau) or (toan tap))*.