Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
trung tuan » trung thanh, trung tam, tran tuan
nhung cong » dung cong, thong cong, hang cong
thanh chau » thanh cha, thanh cham, thanh chu
hoc thieu » toc thieu, hoc hien
trung cua » truong cua, trung cap, dung cua
cong tac » cong ty
toan cao » toan ban, toan tap

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