Perhaps you should try some spelling variations:
nhanh tinh » nhanh thanh, nhan sinh
hanh trinh » canh tranh, hanh chinh
ngung cong » nhung cong, dung cong, nganh cong
hoc chieu » ho chieu, hoc hien, hoc dieu
hoc thieu » toc thieu, hoc hien
cong bang » cuong bang, dong bang, hong bang
bang than » bang thanh, ban than, sang than
than tap » toan tap, han tap, phan 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 chieu) or (hoc thieu)) sach - ((nhanh tinh) OR (hanh trinh)) 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 - ((nhanh tinh) OR (hanh trinh)) chat ngung cong bang than tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc chieu) or (hoc thieu)) sach - ((nhanh tinh) OR (hanh trinh)) chat ngung cong bang than tap".
• Adding a wildcard symbol may retrieve word variants: ((hoc chieu) or (hoc thieu)) sach - ((nhanh tinh) OR (hanh trinh)) chat ngung cong bang than tap*.