Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
doi chieu » doc hieu, ho chieu, mot chieu
trinh cua » trinh luat, trinh quan, trinh luan
tinh cua » sinh cua, tinh chat, tranh cua
cong tan » cong tac, cong san, cong thanh
tan phan » toan phan, than phan, van phan
phan cau » phan dau, phan cac, phan tu
doi chi » doi khi

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 (doi chi)) sang - hanh ((tinh cua) OR (trinh cua)) nhung cong tan phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (doi chi)) sang - hanh ((tinh cua) OR (trinh cua)) nhung cong tan phan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) or (doi chi)) sang - hanh ((tinh cua) OR (trinh cua)) nhung cong tan phan cau".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (doi chi)) sang - hanh ((tinh cua) OR (trinh cua)) nhung cong tan phan cau*.