Perhaps you should try some spelling variations:
thien chien » thien nhien
hanh trang » thanh trung, canh tranh, hanh trinh
thong cong » trong cong, tong cong, thong thong
van hieu » cao hieu
trang va » tran van, hang va
va thong » va thuong, va phuong, he thong
tac toan » tam toan, hach toan, tich toan
tap toan » tap doan, tap quan, bai toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((van hieu) or (thien chien)) lang - hanh trang va thong cong ((tac toan) OR (tap toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((van hieu) OR (thien chien)) lang - hanh trang va thong cong ((tac toan) OR (tap toan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((van hieu) or (thien chien)) lang - hanh trang va thong cong ((tac toan) OR (tap toan)) cau".
• Adding a wildcard symbol may retrieve word variants: ((van hieu) or (thien chien)) lang - hanh trang va thong cong ((tac toan) OR (tap toan)) cau*.