Perhaps you should try some spelling variations:
chieu xanh » chieu sang, chieu tinh, hieu manh
chieu sach » chinh sach, chiet tach, chieu sang
canh trinh » canh tranh, canh tinh, anh trinh
hanh trinh » canh tranh, hanh chinh
nang cong » nang song, dang cong, bang cong
cong van » cong vang, cong san, song van
va nang » van nang, da nang, cam nang
ban can » ban dan, ban hang, ban hanh

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

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