Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
thanh tung » thanh cong
hien sang » hien trang, khien bang, chieu sang
dong cong » duong cong, dung cong, dang cong
tung van » trung van, tang van, dung van
cong tan » cong tac, cong san, cong thanh
toan cau » toan ban, toan tap, toan tai
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: hoc ((hien sang) or (chieu sach)) - thanh tung van dong cong tan ((toan cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien sang) OR (chieu sach)) - thanh tung van dong cong tan ((toan cau) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: hoc ((hien sang) or (chieu sach)) - thanh tung van dong cong tan ((toan cau) or (toan cao))*.