Perhaps you should try some spelling variations:
truong dang » truong giang, truong quang, truong dai
hien trang » huyen trang, mien trung, bien trong
trong dang » trong dan, trong dong, trong dung
hien sang » khien bang, chieu sang, thien bang
quang qua » quang cua, quang tuan, quang xuan
qua dung » quang dung, su dung, qua song

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 sang) OR (hien trang)) - tinh quang qua dung ((trong dang) or (truong dang)) van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien sang) OR (hien trang)) - tinh quang qua dung ((trong dang) OR (truong dang)) van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien sang) OR (hien trang)) - tinh quang qua dung ((trong dang) or (truong dang)) van ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien sang) OR (hien trang)) - tinh quang qua dung ((trong dang) or (truong dang)) van ban*.