Perhaps you should try some spelling variations:
chieu sach » chinh sach, chieu sang, chieu xanh
hanh trung » thanh trung, hanh trang, manh trung
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
trung cua » truong cua, trung tuan, trung cap
cua nhung » va nhung
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: hoc ((hieu lang) or (((chieu sach) OR (chiet tach)))) - hanh trung cua nhung cong tan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu lang) OR (((chieu sach) OR (chiet tach)))) - hanh trung cua nhung cong tan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu lang) or (((chieu sach) OR (chiet tach)))) - hanh trung cua nhung cong tan toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu lang) or (((chieu sach) OR (chiet tach)))) - hanh trung cua nhung cong tan toan cau*.