Perhaps you should try some spelling variations:
thanh trung » thanh tung
luong quang » luong quan, dung quang
quang toan » quang tuan, quang tran, quang doan
hieu sang » chieu sang, hieu lang, hieu quang
dap thong » phap thong, khap thong, va thong
pho thong » he thong
doc hieu » toc thieu, hoc thieu, hoc hien
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: doc hieu sang - thanh trung ((dap thong) or (pho thong)) luong quang toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sang - thanh trung ((dap thong) OR (pho thong)) luong quang toan cao.
• Adding a wildcard symbol may retrieve word variants: doc hieu sang - thanh trung ((dap thong) or (pho thong)) luong quang toan cao*.