Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
thong cong » trong cong, tong cong, thong thong
hieu lang » chieu sang, hieu quang, nhieu tang
hanh tran » hanh trang, thanh tran, hanh tram
van thong » van thuong, van phong, va thong
tran van » luan van
cong anh » cong danh, dong anh, hong anh
anh quan » anh tuan, ban quan, anh nhan
quan cau » quang cao, toan cau, quan ha

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((hieu lang) or (chieu sach)) - hanh tran van thong cong anh quan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (chieu sach)) - hanh tran van thong cong anh quan cau.
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) or (chieu sach)) - hanh tran van thong cong anh quan cau*.