Perhaps you should try some spelling variations:
dong thanh » truong thanh
hanh tran » hanh trang, thanh tran, hanh tram
van nhung » van nhuong, va nhung, van hung
khi xanh » khia canh, thi hanh, thi anh
tran van » luan van
cong san » cong tac
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: doi khi xanh - hanh tran van nhung ((((cong san) or (cong dong))) or (dong thanh)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi khi xanh - hanh tran van nhung ((((cong san) OR (cong dong))) OR (dong thanh)) toan cau.
• Adding a wildcard symbol may retrieve word variants: doi khi xanh - hanh tran van nhung ((((cong san) or (cong dong))) or (dong thanh)) toan cau*.