Perhaps you should try some spelling variations:
khong cong » thong cong, khong cang, khong con
chieu tinh » trieu tinh, lieu tinh, chau tinh
chong cong » cong cong, thong cong, cuong cong
hanh manh » hanh mang, lanh manh, hoang manh
hach toan » thanh toan, manh toan
ho chieu » theo chieu, hoc thieu, doi chieu
manh cua » doanh cua, ban cua
tac toan » tap toan, tam toan, tich toan

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu tinh - hanh manh cua ((khong cong) OR (chong cong)) ((tac toan) OR (hach toan)) cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu tinh - hanh manh cua ((khong cong) or (chong cong)) ((tac toan) OR (hach toan)) cao~".
• Adding a wildcard symbol may retrieve word variants: ho chieu tinh - hanh manh cua ((khong cong) or (chong cong)) ((tac toan) OR (hach toan)) cao*.