Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
doi chieu » doc hieu, doi chi, ho chieu
hanh sinh » hanh tinh, hinh sinh, hanh chinh
hanh dinh » thanh dinh, hinh dinh, hanh tinh
cong cong » cong dong, trong cong, dung cong
cong dan » cong san, cong tan, huong dan
dan phan » doan phan, dan chan, van phan
phan cac » nhan cach, phan dau, phan lap
va cong » tai cong, cua cong

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) or (theo chieu)) xanh - ((hanh sinh) OR (hanh dinh)) va cong cong dan phan cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (theo chieu)) xanh - ((hanh sinh) OR (hanh dinh)) va cong cong dan phan cac.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) or (theo chieu)) xanh - ((hanh sinh) OR (hanh dinh)) va cong cong dan phan cac".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (theo chieu)) xanh - ((hanh sinh) OR (hanh dinh)) va cong cong dan phan cac*.