Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hanh trinh » canh tranh, hanh chinh
hieu lang » chieu sang, hieu quang, nhieu tang
trinh cua » tinh cua, trinh luat, trinh quan
cua thong » cua thuong, cua khong, cua tong
tac toan » tam toan, hach toan, tich toan
tap toan » tap doan, tap quan, bai 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 trinh cua thong cong ((tac toan) or (tap toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - hanh trinh cua thong cong ((tac toan) OR (tap toan)) cao.
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - hanh trinh cua thong cong ((tac toan) or (tap toan)) cao*.