Perhaps you should try some spelling variations:
phuong cong » phuong dong, phong cong, phung cong
cua phuong » cuu phuong, cuc phuong, luan phuong
hieu lang » chieu sang, hieu quang, nhieu tang
hanh manh » hanh mang, lanh manh, hoang manh
manh cua » doanh cua, ban cua
tac toan » tap toan, hach toan, tich toan
tam toan » tap toan, tam than, pham toan
ho hieu » ho chieu, hoi hieu, nho hieu

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 - hanh manh cua phuong cong ((tac toan) OR (tam toan)) cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - hanh manh cua phuong cong ((tac toan) OR (tam toan)) cao".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - hanh manh cua phuong cong ((tac toan) OR (tam toan)) cao*.