Perhaps you should try some spelling variations:
phuong trinh » cong trinh, huong tran, phuong anh
chuong trinh » cong trinh
nhieu tang » chieu sang, nhiet nang
hieu lang » chieu sang, hieu quang, hieu van
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
toan ban » van ban
tinh va » tich va, trinh van, trinh vat

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((nhieu tang) or (hieu lang)) - hanh tinh va nhung ((phuong trinh) OR (chuong trinh)) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((nhieu tang) OR (hieu lang)) - hanh tinh va nhung ((phuong trinh) OR (chuong trinh)) toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((nhieu tang) or (hieu lang)) - hanh tinh va nhung ((phuong trinh) OR (chuong trinh)) toan ban".
• Adding a wildcard symbol may retrieve word variants: doi ((nhieu tang) or (hieu lang)) - hanh tinh va nhung ((phuong trinh) OR (chuong trinh)) toan ban*.