Perhaps you should try some spelling variations:
hanh trinh » hanh chinh
chap nhung » chap thuong, cua nhung, tham nhung
nhung cong » dung cong, thong cong, hang cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
toc hieu » toc thieu, doc hieu, hoc thieu
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: toc hieu manh - ((canh tranh) or (hanh trinh)) chap nhung cong tap toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc hieu manh - ((canh tranh) OR (hanh trinh)) chap nhung cong tap toan cao.
• Adding a wildcard symbol may retrieve word variants: toc hieu manh - ((canh tranh) or (hanh trinh)) chap nhung cong tap toan cao*.