Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hanh trinh » canh tranh
cong khanh » cong thanh, cong khan, cong nhan
khanh toan » thanh toan, khanh thanh, khanh thuan
hieu sang » chieu sang, hieu lang, hieu quang
cua nhung » va nhung
doc hieu » toc thieu, hoc thieu, hoc hien
toan cau » 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: doc hieu sang - ((hanh trinh) or (hanh chinh)) cua nhung cong khanh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sang - ((hanh trinh) OR (hanh chinh)) cua nhung cong khanh toan cau.
• Adding a wildcard symbol may retrieve word variants: doc hieu sang - ((hanh trinh) or (hanh chinh)) cua nhung cong khanh toan cau*.