Perhaps you should try some spelling variations:
theo chieu » theo tieu, theo chu, thi chieu
trinh hoan » trinh han, trinh toan, trinh chuan
nhung cong » dung cong, thong cong, hang cong
trinh hoa » trinh do, trinh han
ho chieu » hoc thieu, doi chieu, mot chieu
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo chieu) OR (ho chieu)) sach - hanh ((trinh hoan) or (trinh hoa)) nhung cong dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (ho chieu)) sach - hanh ((trinh hoan) OR (trinh hoa)) nhung cong dan than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) OR (ho chieu)) sach - hanh ((trinh hoan) or (trinh hoa)) nhung cong dan than cau".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) OR (ho chieu)) sach - hanh ((trinh hoan) or (trinh hoa)) nhung cong dan than cau*.