Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
nang duong » nang luong, nang dong, tang duong
hoc thieu » toc thieu, hoc hien
qua trong » quan trong, qua trinh, qua song
cong dan » cong san, cong tan, huong dan
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 duong qua trong cong dan ((than cau) or (phan cac))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - nang duong qua trong cong dan ((than cau) OR (phan cac)).
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - nang duong qua trong cong dan ((than cau) or (phan cac))*.