Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh luat, trinh han
nhung cong » dung cong, thong cong, hang cong
doi chieu » doc hieu, ho chieu, mot chieu
trinh cua » tinh cua, trinh luat, trinh luan
cong tan » cong tac, cong san, cong thanh
tan than » tan thanh, tan tran, ban than
than cau » toan cau, phan cau, than cap
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)) sach - hanh ((trinh cua) OR (trinh quan)) nhung cong tan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (doi chi)) sach - hanh ((trinh cua) OR (trinh quan)) nhung cong tan than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) or (doi chi)) sach - hanh ((trinh cua) OR (trinh quan)) nhung cong tan than cau".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (doi chi)) sach - hanh ((trinh cua) OR (trinh quan)) nhung cong tan than cau*.