Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
thang va » hang va, trang va, thanh va
thong va » thong cua, truong va, thong qua
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.

• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (hieu lang)) - anh ((thang va) OR (thong va)) nhung cong tan toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sach) or (hieu lang)) - anh ((thang va) OR (thong va)) nhung cong tan toan cau~".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) or (hieu lang)) - anh ((thang va) OR (thong va)) nhung cong tan toan cau*.