Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
trinh hoan » trinh han, trinh toan, trinh chuan
trinh hoa » trinh do, trinh han
hang cong » dang cong, hang nong, bang cong
cong ban » cong bang, cong san, cong tan
than cau » toan cau, than cap, thanh chau
phan cau » phan dau, phan cac, phan tu

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