Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
thanh trung » thanh tung
thieu sang » thieu khang, hieu lang, nhieu tang
chieu sang » chieu sach, chieu xanh, hieu lang
trung cap » truong cao, trung tam
dong cong » duong cong, dung cong, dang cong
cap dong » cao dong, cau dong, ca dong
cong tam » cong tac, cong tan, cong nam
tam toan » tap toan, tam than, pham toan
toan cau » toan cao, toan ban, toan tap

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 (chieu sang))) or (thieu quang)) - thanh trung cap dong cong tam toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((((thieu sang) OR (chieu sang))) OR (thieu quang)) - thanh trung cap dong cong tam toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((((thieu sang) OR (chieu sang))) or (thieu quang)) - thanh trung cap dong cong tam toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((((thieu sang) OR (chieu sang))) or (thieu quang)) - thanh trung cap dong cong tam toan cau*.