Perhaps you should try some spelling variations:
toan nhuong » toan thuong, toan thong, doan phuong
canh trinh » canh tranh, hanh trinh, canh tinh
trinh toan » tinh toan, thanh toan, trinh han
doi chieu » doc hieu, doi chi, mot chieu
dung manh » duong manh, hung manh, tung manh
dung danh » dung doanh, dung dan, cuong danh
ho chieu » theo chieu, hoc thieu, mot chieu
toan tap » toan ban

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) OR (doi chieu)) sang - canh trinh toan nhuong ((dung manh) OR (dung danh)) toan tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (doi chieu)) sang - canh trinh toan nhuong ((dung manh) OR (dung danh)) toan tap~".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (doi chieu)) sang - canh trinh toan nhuong ((dung manh) OR (dung danh)) toan tap*.