Perhaps you should try some spelling variations:
phuong cong » phuong dong, phong cong, phung cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
hoc hieu » hoc thieu, hoc hien, doc hieu
cong cuc » cong chuc, cong cuoc, cong cua
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan tap » toan ban
cong cu » chung cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu manh - thanh ((cong cuc) or (cong cu)) phuong cong tac toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - thanh ((cong cuc) OR (cong cu)) phuong cong tac toan tap*.