Perhaps you should try some spelling variations:
thanh dung » thanh duong, thanh tung, thanh hung
quang cong » quang cuong, quang dong, quang hoang
doi chieu » doc hieu, doi chi, mot chieu
dat quang » dau quang, chat quang, dang quang
dung dat » dung va, dung tai
cong tan » cong tac, cong san, cong thanh
tran tap » toan tap, tran tan, tran tuan

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) or (toc thieu)) tinh - thanh dung dat quang cong tan tran tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (toc thieu)) tinh - thanh dung dat quang cong tan tran tap.
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (toc thieu)) tinh - thanh dung dat quang cong tan tran tap*.