Perhaps you should try some spelling variations:
nhieu tang » chieu sang, nhiet nang
hanh trinh » canh tranh, hanh chinh
hieu lang » chieu sang, hieu quang, hieu van
cua dong » chua dong, cua cong, cua dang
qua dung » quang dung, su dung, qua song
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
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: theo ((nhieu tang) or (hieu lang)) - hanh trinh ((cua dong) or (qua dung)) cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((nhieu tang) OR (hieu lang)) - hanh trinh ((cua dong) OR (qua dung)) cong tac toan cau.
• Adding a wildcard symbol may retrieve word variants: theo ((nhieu tang) or (hieu lang)) - hanh trinh ((cua dong) or (qua dung)) cong tac toan cau*.