Perhaps you should try some spelling variations:
nhung phuong » dung phuong, nhu phuong, truong phuong
phuong tinh » phuong trinh, phuong binh, khuong tinh
nhieu tang » chieu sang, hieu lang, nhiet nang
hieu quang » thieu quang, hieu quan, hieu qua
tranh cua » doanh cua, manh cua
trung cua » truong cua, trung tuan, trung cap
toan tap » toan ban

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 quang)) - hanh ((tranh cua) or (trung cua)) nhung phuong tinh toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((nhieu tang) OR (hieu quang)) - hanh ((tranh cua) OR (trung cua)) nhung phuong tinh toan tap.
• Adding a wildcard symbol may retrieve word variants: doi ((nhieu tang) or (hieu quang)) - hanh ((tranh cua) or (trung cua)) nhung phuong tinh toan tap*.