Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
nhung cong » dung cong, thong cong, hang cong
hoc thieu » toc thieu, hoc hien
tang quan » tang luan, tong quan, thong quan
nang quan » ban quan, nang suat
cong dan » cong san, cong tan, huong dan
than cao » toan cao, thai cao, than sao
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 ((tang quan) or (nang quan)) nhung cong dan ((than cao) OR (than cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - hanh ((tang quan) OR (nang quan)) nhung cong dan ((than cao) OR (than cap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sang - hanh ((tang quan) or (nang quan)) nhung cong dan ((than cao) OR (than cap))".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - hanh ((tang quan) or (nang quan)) nhung cong dan ((than cao) OR (than cap))*.