Perhaps you should try some spelling variations:
thanh trinh » hanh trinh, thanh tinh, thanh binh
hanh doanh » hang doanh, chinh doanh, doanh doanh
tai thanh » thi thanh, tai chinh, ban thanh
tu hanh » du hanh, lu hanh, thuc hanh
va khi » va chi, va kha
ky chi » ky thi, ly chi, ke chi
va ki » va ky, ve ki, va vi

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu hanh doanh ((va khi) or (va ki)) đong luc ) or ( tai thanh trinh ky chi đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu hanh doanh ((va khi) OR (va ki)) đong luc ) OR ( tai thanh trinh ky chi đong luc )).
• Adding a wildcard symbol may retrieve word variants: (( tu hanh doanh ((va khi) or (va ki)) đong luc ) or ( tai thanh trinh ky chi đong luc ))*.