Perhaps you should try some spelling variations:
thien chinh » tien thinh, thien chien, thi chinh
hanh tang » hanh trang, hanh mang, hanh tung
nang cong » nang song, dang cong, bang cong
van thanh » ban thanh, van tuan
anh tang » anh bang, anh dang, anh nang
kha nang » phap nang, ky nang, ki nang
dan toan » van toan, dan than, manh toan

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: thien chinh sach - ((hanh tang) OR (anh tang)) kha nang cong ((dan toan) OR (van thanh)) cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thien chinh sach - ((hanh tang) OR (anh tang)) kha nang cong ((dan toan) or (van thanh)) cao~".
• Adding a wildcard symbol may retrieve word variants: thien chinh sach - ((hanh tang) OR (anh tang)) kha nang cong ((dan toan) or (van thanh)) cao*.