Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
luan thong » luan tuong, luat thong, xuan thong
luan phong » luan phuong, xuan phuong, van phong
hanh tang » hanh trang, anh tang, hanh mang
ho chieu » theo chieu, hoc thieu, doi chieu
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai 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: ho chieu sach - hanh tang ((luan thong) or (luan phong)) cong tap toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - hanh tang ((luan thong) OR (luan phong)) cong tap toan cao.
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - hanh tang ((luan thong) or (luan phong)) cong tap toan cao*.