Perhaps you should try some spelling variations:
thieu khang » chieu khong, thieu quang
phuong cong » phuong dong, phong cong, phung cong
thieu sang » chieu sang, thieu quang, hieu lang
lan phuong » van phuong, dan phuong, lan thuong
cong manh » cong danh, duong manh, cong thanh
anh dang » anh dong, anh dung, anh bang
dang lan » dang van, dang dan, dang hanh
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 sang) OR (thieu khang)) - anh dang lan phuong cong manh ((toan ban) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (thieu khang)) - anh dang lan phuong cong manh ((toan ban) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) OR (thieu khang)) - anh dang lan phuong cong manh ((toan ban) or (toan tap))".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) OR (thieu khang)) - anh dang lan phuong cong manh ((toan ban) or (toan tap))*.