Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hanh trang » thanh trung, canh tranh, minh trang
cong ngang » cong nhan, cong quang, cong lang
hieu lang » chieu sang, hieu quang, nhieu tang
cua trung » cua truong, xuan trung, cua nhung
cong vang » cong lang, cong quang, cong san
hoc hieu » hoc thieu, hoc hien, doc hieu
quan cau » quang cao, toan cau, quan ha

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - ((hanh trang) OR (hanh trinh)) cua trung ((cong vang) OR (cong ngang)) quan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu lang - ((hanh trang) OR (hanh trinh)) cua trung ((cong vang) or (cong ngang)) quan cau~".
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - ((hanh trang) OR (hanh trinh)) cua trung ((cong vang) or (cong ngang)) quan cau*.