Perhaps you should try some spelling variations:
tranh nhung » trinh nhung, tranh hang, tran hung
chieu sang » chieu sach, chieu xanh, hieu lang
cong thanh » dong thanh, cong trinh, cong tan
doi chieu » doc hieu, doi chi, mot chieu
tan tranh » tan tran, can tranh, lan tranh
cong tac » cong ty
toan cau » toan cao, toan ban, toan tap
anh tan » anh tuan, anh toan, anh tang

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chieu sang - anh tan tranh nhung ((cong tac) or (cong thanh)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - anh tan tranh nhung ((cong tac) OR (cong thanh)) toan cau.
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - anh tan tranh nhung ((cong tac) or (cong thanh)) toan cau*.