Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
thuong dong » phuong dong, tuong dong, chuong dong
thieu sang » chieu sang, thieu khang, hieu lang
phi thuong » thi thuong, phan thuong, pham thuong
dang thanh » dong thanh, hoang thanh, quang thanh
than dinh » thuan dinh, thanh dinh, than kinh
dang hanh » ban hanh, dang van, dang hung
dinh phi » dinh thi, dinh chi, dinh phu

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 sang) or (thieu quang)) - than dinh phi thuong dong ((dang thanh) or (dang hanh)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (thieu quang)) - than dinh phi thuong dong ((dang thanh) OR (dang hanh)) tap.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) or (thieu quang)) - than dinh phi thuong dong ((dang thanh) or (dang hanh)) tap*.