Perhaps you should try some spelling variations:
nhung phuong » dung phuong, nhu phuong, truong phuong
phuong trinh » chuong trinh, cong trinh, huong tran
chieu sang » chieu sach, chieu xanh, nhieu tang
trinh toan » tinh toan, thanh toan, trinh han
hieu lang » hieu quang, nhieu tang, hieu van
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
toan cau » toan cao, toan ban, toan tap
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 ((chieu sang) or (hieu lang)) - hanh tinh va nhung phuong trinh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sang) OR (hieu lang)) - hanh tinh va nhung phuong trinh toan cau.
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sang) or (hieu lang)) - hanh tinh va nhung phuong trinh toan cau*.