Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
trinh quan » tinh quang, trinh han
thong cong » trong cong, tong cong, thong thong
hoc thieu » toc thieu, hoc hien
cong van » cong vang, cong san, song van
than cau » toan cau, phan cau, thanh chau
than cap » khan cap, thanh lap, thanh cac

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 ((trinh quan) or (trinh luat)) thong cong van ((than cau) OR (than cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - hanh ((trinh quan) OR (trinh luat)) thong cong van ((than cau) OR (than cap))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sang - hanh ((trinh quan) or (trinh luat)) thong cong van ((than cau) OR (than cap))*".