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
mang qua » mang cua, nang quan, tang quan
mang vua » mang cua, mang va, hang va
cong san » cong tac
than cao » thai cao, than cap, than sao
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 ((mang qua) or (mang vua)) nhung cong san ((than cao) OR (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - hanh ((mang qua) OR (mang vua)) nhung cong san ((than cao) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sang - hanh ((mang qua) or (mang vua)) nhung cong san ((than cao) OR (toan cao))".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - hanh ((mang qua) or (mang vua)) nhung cong san ((than cao) OR (toan cao))*.