Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hieu manh » chieu xanh, hieu nganh, dieu hanh
hanh sinh » hanh tinh, hanh dinh, hinh sinh
sinh khoa » sinh hoc, sinh hoat, anh khoa
khoa hang » khoa dang, khoai lang, kho tang
hang cong » dang cong, hang nong, bang cong
cong manh » cong danh, duong manh, cong thanh
manh toan » thanh toan, anh tuan, tinh toan
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 ((hieu manh) or (chieu sach)) - hanh sinh khoa hang cong manh toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((hieu manh) OR (chieu sach)) - hanh sinh khoa hang cong manh toan cao.
• Adding a wildcard symbol may retrieve word variants: doi ((hieu manh) or (chieu sach)) - hanh sinh khoa hang cong manh toan cao*.