Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
trinh cua » trinh luat, trinh quan, trinh luan
dang cong » dung cong
moi sach » hoc sach, bo sach, co sach
tinh cua » sinh cua, tinh chat, tranh cua
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((moi sach) or (chieu sach)) - hanh ((trinh cua) OR (tinh cua)) dang cong tan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((moi sach) OR (chieu sach)) - hanh ((trinh cua) OR (tinh cua)) dang cong tan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((moi sach) or (chieu sach)) - hanh ((trinh cua) OR (tinh cua)) dang cong tan toan cau".
• Adding a wildcard symbol may retrieve word variants: doi ((moi sach) or (chieu sach)) - hanh ((trinh cua) OR (tinh cua)) dang cong tan toan cau*.