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

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

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