Perhaps you should try some spelling variations:
ngung cong » nhung cong, dung cong, nganh cong
hoc chieu » ho chieu, hoc hien, hoc dieu
hoc thieu » toc thieu, hoc hien
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
cong bang » cuong bang, dong bang, hong bang
bang than » bang thanh, ban than, sang than
than tap » toan tap, han tap, phan tap
chat » nhat, phat

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc chieu) or (hoc thieu)) sach - hanh tinh chat ngung cong bang than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc chieu) OR (hoc thieu)) sach - hanh tinh chat ngung cong bang than tap.
• Adding a wildcard symbol may retrieve word variants: ((hoc chieu) or (hoc thieu)) sach - hanh tinh chat ngung cong bang than tap*.