Perhaps you should try some spelling variations:
trinh chuan » trinh han, trinh quan, trinh luan
theo chieu » theo tieu, ho chieu, theo chu
chieu xanh » chieu sach, chieu sang, chieu tinh
hanh trinh » canh tranh, hanh chinh
nang cong » nang song, bang cong, hang cong
dang cong » dung cong
van toan » van tuan, van tan, van thanh
toan tap » toan 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 xanh - hanh trinh chuan ((nang cong) OR (dang cong)) van toan tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu xanh - hanh trinh chuan ((nang cong) OR (dang cong)) van toan tap".
• Adding a wildcard symbol may retrieve word variants: theo chieu xanh - hanh trinh chuan ((nang cong) OR (dang cong)) van toan tap*.