Perhaps you should try some spelling variations:
tranh trong » tran trong, trinh trong, anh trong
cong thanh » dong thanh, cong tan, truong thanh
hieu lang » chieu sang, hieu quang, nhieu tang
nha dung » kha dung, nha cung, nha dong
toan cau » toan cao, toan ban, toan tap
ho hieu » ho chieu, hoi hieu, nho hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - tranh trong nha dung ((cong thanh) or (cong trinh)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - tranh trong nha dung ((cong thanh) OR (cong trinh)) toan cau*.