Perhaps you should try some spelling variations:
hanh trinh » hanh chinh
nhung cong » dung cong, thong cong, hang cong
chi sang » chi lang, chieu sang, chi chang
cong san » cong tac
san than » sang than, san thanh, ban than
than cao » toan cao, thai cao, than cap
doi chi » doi khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chi sang - ((canh tranh) or (hanh trinh)) va nhung cong san than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chi sang - ((canh tranh) OR (hanh trinh)) va nhung cong san than cao.
• Adding a wildcard symbol may retrieve word variants: doi chi sang - ((canh tranh) or (hanh trinh)) va nhung cong san than cao*.