Perhaps you should try some spelling variations:
trinh chuan » trinh han, trinh quan, trinh luan
theo chieu » ho chieu, theo chu, thi chieu
hanh trinh » canh tranh, hanh chinh
nang cong » nang song, bang cong, hang cong
dang cong » dung cong
tan toan » tan tran, tap toan, van toan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo chieu) or (theo tieu)) xanh - hanh trinh chuan ((nang cong) OR (dang cong)) tan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (theo tieu)) xanh - hanh trinh chuan ((nang cong) OR (dang cong)) tan toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) or (theo tieu)) xanh - hanh trinh chuan ((nang cong) OR (dang cong)) tan toan ban".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (theo tieu)) xanh - hanh trinh chuan ((nang cong) OR (dang cong)) tan toan ban*.