Perhaps you should try some spelling variations:
luong quang » luong quan, dung quang
chiet tach » chieu sach
cong quang » thong quang, duong quang, dang quang
ho chiet » ho chieu, ho thiet, hoc thiet
tung dao » tuong dao, hung dao, tung do
tung dan » dung dan, huong dan, trung dai
thong tu » phong tuc, thong tin, thong ke

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chiet tach - thanh ((tung dao) OR (tung dan)) tong ((cong quang) or (luong quang)) thong tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chiet tach - thanh ((tung dao) OR (tung dan)) tong ((cong quang) OR (luong quang)) thong tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chiet tach - thanh ((tung dao) OR (tung dan)) tong ((cong quang) or (luong quang)) thong tu".
• Adding a wildcard symbol may retrieve word variants: ho chiet tach - thanh ((tung dao) OR (tung dan)) tong ((cong quang) or (luong quang)) thong tu*.