Perhaps you should try some spelling variations:
phuong cong » phuong dong, phong cong, phuong hoang
phung cong » nhung cong, phong cong, nhung chong
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, tam toan, hach toan
toan cao » toan ban, toan tap
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) OR (phung cong)) tac toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - hanh manh cua ((phuong cong) OR (phung cong)) tac toan cao".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - hanh manh cua ((phuong cong) OR (phung cong)) tac toan cao*.