Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
trang tuan » tran tuan, trung tuan, tran xuan
trong tuan » trong quan, trung tuan, trong tan
thong cong » trong cong, tong cong, thong thong
hoc thieu » toc thieu, hoc hien
cong tan » cong tac, cong san, cong thanh
toan cau » toan cao, toan tap, toan tai
toan ban » van 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 - hanh ((trang tuan) OR (trong tuan)) thong cong tan ((toan cau) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sang - hanh ((trang tuan) or (trong tuan)) thong cong tan ((toan cau) OR (toan ban))~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - hanh ((trang tuan) or (trong tuan)) thong cong tan ((toan cau) OR (toan ban))*.