Perhaps you should try some spelling variations:
thanh truong » thanh trung, thanh thuong, thanh tung
thieu quang » thien quan, trien quang, hieu quan
hieu quang » hieu quan, hieu qua, diep quang
truong cua » truong ca, truong quan, truong cao
cua trong » cua truong, cua trung, qua trong
cong tan » cong tac, cong san, cong thanh
tan than » tan thanh, tan tran, ban than
than cau » toan cau, phan cau, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu quang) or (thieu quang)) - thanh truong cua trong cong tan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu quang) OR (thieu quang)) - thanh truong cua trong cong tan than cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu quang) or (thieu quang)) - thanh truong cua trong cong tan than cau*.