Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
chieu sang » chieu sach, chieu xanh, hieu lang
tinh sinh » tinh ninh, tinh binh, tinh hinh
dang cong » dung cong
cong tinh » cong trinh, cong vinh, long tinh
vat dang » van dang, vat dung, va dang
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu quang) or (chieu sang)) - tinh sinh vat dang cong tinh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu quang) OR (chieu sang)) - tinh sinh vat dang cong tinh toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu quang) or (chieu sang)) - tinh sinh vat dang cong tinh toan ban*.