Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
trinh kham » trinh cham, trinh khai, trinh han
tranh kha » tranh ha, tranh chap, trinh khai
nang cong » nang song, dang cong, bang cong
cong dan » cong san, cong tan, huong dan

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: theo chieu sach - canh ((tranh kha) OR (trinh kham)) nang cong dan ((toan ban) OR (van ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sach - canh ((tranh kha) or (trinh kham)) nang cong dan ((toan ban) OR (van ban))~".
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - canh ((tranh kha) or (trinh kham)) nang cong dan ((toan ban) OR (van ban))*.