Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, mot chieu
trinh san » trinh han, trinh quan, trinh toan
dung cong » dung trong
ho chieu » theo chieu, hoc thieu, mot chieu
trinh tu » trinh ky, trinh do
cong dan » cong san, cong tan, huong dan
dan cua » dan ca, ban cua, dai cua
cua cau » cua cac, cua chu, cua cay

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 (ho chieu)) tinh - hanh ((trinh san) OR (trinh tu)) dung cong dan cua cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) OR (ho chieu)) tinh - hanh ((trinh san) or (trinh tu)) dung cong dan cua cau~".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) OR (ho chieu)) tinh - hanh ((trinh san) or (trinh tu)) dung cong dan cua cau*.