Perhaps you should try some spelling variations:
xuan trung » xuan truong, quang trung, doan trung
hanh tranh » canh tranh, hanh trinh, hanh trang
hieu manh » chieu xanh, hieu nganh, dieu hanh
cua trung » cua truong, cua nhung, ba trung
hoc hieu » hoc thieu, hoc hien, doc hieu
dan than » dan chan, ban than, van 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 hieu manh - hanh tranh ((cua trung) or (xuan trung)) huong dan than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - hanh tranh ((cua trung) OR (xuan trung)) huong dan than tap*.