Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
tieu sach » chieu sach, dien sach, te sach
thang va » hang va, trang va, thong va
cong tan » cong tac, cong san, cong thanh
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban
tang va » trang va, tang van, tang vat

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 tieu sach - hanh ((tang va) OR (thang va)) nhung cong tan ((toan cau) OR (toan tap))~".
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - hanh ((tang va) OR (thang va)) nhung cong tan ((toan cau) OR (toan tap))*.