Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh than » trinh thanh, trinh han, trinh toan
trinh hoa » trinh do, trinh han
than khoi » than khai, than thoai, thoat khoi
lu hanh » luu hanh, du hanh, ly hanh
hoa thi » hoa thai, ha thi, hoa phi
tu hanh » du hanh, thuc hanh, thi hanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( lu hanh trinh hoa thi đong luc ) or ( tu hanh trinh than khoi đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( lu hanh trinh hoa thi đong luc ) OR ( tu hanh trinh than khoi đong luc )).
• Adding a wildcard symbol may retrieve word variants: (( lu hanh trinh hoa thi đong luc ) or ( tu hanh trinh than khoi đong luc ))*.