Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, thong cong, hang cong
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
cong tan » cong tac, cong san, cong thanh
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban
tinh va » tich va, trinh van, trinh vat

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chieu sach) or (nhiet dong)) - hanh tinh va nhung cong tan ((toan cau) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (nhiet dong)) - hanh tinh va nhung cong tan ((toan cau) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) or (nhiet dong)) - hanh tinh va nhung cong tan ((toan cau) or (toan tap))*.