Perhaps you should try some spelling variations:
thi chieu » thi chien, thi hieu, theo chieu
dang cong » dung cong
ho chieu » theo chieu, hoc thieu, doi chieu
tung cua » trung cua, tuong cua, tang cua
dung cua » dung luan, dung cho
cong tam » cong tac, cong tan, cong nam
tam toan » tap toan, tam than, pham toan
toan cau » toan cao, toan ban, toan tap

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: ((thi chieu) OR (ho chieu)) xanh - thanh ((tung cua) OR (dung cua)) dang cong tam toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thi chieu) or (ho chieu)) xanh - thanh ((tung cua) OR (dung cua)) dang cong tam toan cau~".
• Adding a wildcard symbol may retrieve word variants: ((thi chieu) or (ho chieu)) xanh - thanh ((tung cua) OR (dung cua)) dang cong tam toan cau*.