Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
hoc thieu » toc thieu, hoc hien
truong va » truong dai, truong cao, truong dao
trung va » trang va, trung ha, trung tam
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
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 - thanh ((trung va) OR (truong va)) nhung ((cong tan) OR (cong san)) toan tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sang - thanh ((trung va) OR (truong va)) nhung ((cong tan) or (cong san)) toan tap~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - thanh ((trung va) OR (truong va)) nhung ((cong tan) or (cong san)) toan tap*.