Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
trung tuan » trung thanh, trung tam, tran tuan
hoc thieu » toc thieu, hoc hien
trung cua » truong cua, trung cap, dung cua
hang cong » dang cong, hang nong, bang cong
cong tan » cong tac, cong san, cong thanh
toan cau » toan ban, toan tap, toan tai
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 - hanh ((trung cua) or (trung tuan)) hang cong tan ((toan cau) OR (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - hanh ((trung cua) OR (trung tuan)) hang cong tan ((toan cau) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sang - hanh ((trung cua) or (trung tuan)) hang cong tan ((toan cau) OR (toan cao))".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - hanh ((trung cua) or (trung tuan)) hang cong tan ((toan cau) OR (toan cao))*.