Perhaps you should try some spelling variations:
khong cong » thong cong, khong cang, chong cong
hua khong » hoa khong, cua khong, hoac khong
cao sach » co sach, ao sach, cau sach
hau sach » khau sach, cau sach, ham sach
anh tang » anh bang, anh dang, anh nang
tang hua » tang ha, tang cua, tang luan
cong tan » cong tac, cong san, cong thanh
tran cau » tran chau, toan cau, ran cau
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: cua ((cao sach) or (hau sach)) - anh tang hua khong cong tan ((tran cau) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: cua ((cao sach) OR (hau sach)) - anh tang hua khong cong tan ((tran cau) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: cua ((cao sach) or (hau sach)) - anh tang hua khong cong tan ((tran cau) or (toan tap))*.