Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
thanh tung » thanh cong
thong cong » trong cong, tong cong, thong thong
doi chieu » doc hieu, doi chi, ho chieu
cong dan » cong san, cong tan, huong dan
dan phan » doan phan, dan chan, van phan
phan cau » phan dau, phan cac, phan tu

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

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