Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
xuan trung » xuan truong, quang trung, doan trung
hieu lang » chieu sang, hieu quang, nhieu tang
cua nhung » va nhung
cong vang » cong lang, cong quang, cong ngang
vang than » sang than, van than, cang thang
hoc hieu » hoc thieu, hoc hien, doc hieu
than cau » toan cau, phan cau, than cap

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 lang - hanh trinh ((xuan trung) or (cua nhung)) cong vang than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - hanh trinh ((xuan trung) OR (cua nhung)) cong vang than cau.
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - hanh trinh ((xuan trung) or (cua nhung)) cong vang than cau*.