Perhaps you should try some spelling variations:
thong cong » tong cong, thong thong, phong chong
hanh tranh » canh tranh, hanh trinh, hanh trang
tranh cua » doanh cua, manh cua
theo kha » theo phap, thao khoa, theo chu
kha nang » phap nang, ky nang, ki nang
tac toan » tap toan, hach toan, tich toan
tam toan » tap toan, tam than, pham toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo kha nang - hanh tranh cua ((thong cong) OR (trong cong)) ((tac toan) or (tam toan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo kha nang - hanh tranh cua ((thong cong) OR (trong cong)) ((tac toan) OR (tam toan)) tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo kha nang - hanh tranh cua ((thong cong) OR (trong cong)) ((tac toan) or (tam toan)) tap".
• Adding a wildcard symbol may retrieve word variants: theo kha nang - hanh tranh cua ((thong cong) OR (trong cong)) ((tac toan) or (tam toan)) tap*.