Perhaps you should try some spelling variations:
hien quang » dien quang, bien quang, hien quan
thong cong » trong cong, tong cong, thong thong
thanh phan » thanh pho, thanh san, thanh toan
trung dap » trung cap, trung dai, trung lap
trung dam » trung tam, trung dai, trong dam
cong dang » cong dong, cong dan, cong dung
thanh ban » thanh san, thanh van, thanh bac

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien quang - hanh ((trung dap) OR (trung dam)) thong cong dang ((thanh ban) or (thanh phan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien quang - hanh ((trung dap) OR (trung dam)) thong cong dang ((thanh ban) OR (thanh phan)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien quang - hanh ((trung dap) OR (trung dam)) thong cong dang ((thanh ban) or (thanh phan))".
• Adding a wildcard symbol may retrieve word variants: hoc hien quang - hanh ((trung dap) OR (trung dam)) thong cong dang ((thanh ban) or (thanh phan))*.