Perhaps you should try some spelling variations:
song cong » cong cong, tong cong, song hong
chi sach » chinh sach, chieu sach, co sach
hanh cam » hanh cham, hanh lam, hanh nam
cong dan » cong san, cong tan, huong dan
than tap » han tap, phan tap, than cap
toan tap » toan ban
doi chi » doi khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chi sach - hanh cam nang song cong dan ((than tap) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chi sach - hanh cam nang song cong dan ((than tap) OR (toan tap))*.