Perhaps you should try some spelling variations:
nang cong » nang song, dang cong, bang cong
theo rau » theo dau, theo mau, theo chu
rau sach » cau sach, hau sach, khau sach
tranh va » tranh van, trang va, trinh va
cong dan » cong san, cong tan, huong dan
tran cao » tran chau, trang cho, tranh cac
toan cao » toan ban, toan tap
va nang » van nang, da nang, cam nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo rau sach - canh tranh va nang cong dan ((tran cao) OR (toan cao))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo rau sach - canh tranh va nang cong dan ((tran cao) OR (toan cao))".
• Adding a wildcard symbol may retrieve word variants: theo rau sach - canh tranh va nang cong dan ((tran cao) OR (toan cao))*.