Perhaps you should try some spelling variations:
chat nhung » chat ngung, thuat nhung, cua nhung
nhung cong » dung cong, thong cong, hang cong
doi chieu » doc hieu, doi chi, ho chieu
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
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: ((doi chieu) or (toc thieu)) tach - hanh tinh chat nhung cong ((tac toan) OR (tam toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (toc thieu)) tach - hanh tinh chat nhung cong ((tac toan) OR (tam toan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) or (toc thieu)) tach - hanh tinh chat nhung cong ((tac toan) OR (tam toan)) cau".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (toc thieu)) tach - hanh tinh chat nhung cong ((tac toan) OR (tam toan)) cau*.