Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nang luong » nang song
luong than » luong thanh, luong nhan, luong tham
hieu lang » chieu sang, hieu quang, nhieu tang
dung nang » dun nang, dung dang, dung quang
trinh va » trinh van, trinh vat, trinh vi
trinh ve » trinh he, trinh vi, trinh viet
than cau » toan cau, phan cau, than cap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((hieu lang) or (chieu sach)) - hanh ((trinh va) OR (trinh ve)) dung nang luong than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (chieu sach)) - hanh ((trinh va) OR (trinh ve)) dung nang luong than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu lang) or (chieu sach)) - hanh ((trinh va) OR (trinh ve)) dung nang luong than cau".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) or (chieu sach)) - hanh ((trinh va) OR (trinh ve)) dung nang luong than cau*.