Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
quan trong » gian trong
hoc thieu » toc thieu, hoc hien
nang hong » nang song, nang dong, nang cong
hong quan » thong quan, tong quan, uong quan
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
than cau » toan cau, phan cau, than cap
phan cac » nhan cach, phan dau, phan lap

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 - nang hong quan trong ((cong dan) or (cong san)) ((than cau) or (phan cac))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - nang hong quan trong ((cong dan) OR (cong san)) ((than cau) OR (phan cac)).
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - nang hong quan trong ((cong dan) or (cong san)) ((than cau) or (phan cac))*.