Perhaps you should try some spelling variations:
nang luong » nang song
chieu sang » chieu sach, chieu xanh, nhieu tang
luong quan » thong quan, duong qua
quan trong » gian trong
hieu lang » hieu quang, nhieu tang, hieu van
cong tan » cong tac, cong san, cong thanh
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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sang) OR (hieu lang)) - nang luong quan trong cong tan ((than cau) OR (phan cac))~".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) OR (hieu lang)) - nang luong quan trong cong tan ((than cau) OR (phan cac))*.