Perhaps you should try some spelling variations:
chiet tach » chieu sach
thong cong » trong cong, tong cong, thong thong
cong quang » luong quang, thong quang, duong quang
quang than » quang thanh, quang thang, quang tuan
ho chiet » ho chieu, ho thiet, hoc thiet
tung tam » vung tam, dung tam, tuong tac
than cap » khan cap, thanh lap, thanh cac

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 tam) or (trung tam)) thong cong quang than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chiet tach - thanh ((tung tam) OR (trung tam)) thong cong quang than cap*.