Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
chieu sang » chieu sach, chieu xanh, hieu lang
trinh qua » trinh quan, trinh cua, trinh quang
cong nhan » cong nhat, cong thanh, dung nhan
hieu van » hieu va, thien van, lieu va
qua cong » cua cong, qua song, va cong
cong san » cong tac
chuan ha » chuan he, quan ha, chuan bi

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: doi ((chieu sang) OR (hieu van)) - hanh trinh qua cong ((cong nhan) OR (cong san)) chuan ha~.
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sang) or (hieu van)) - hanh trinh qua cong ((cong nhan) or (cong san)) chuan ha*.