Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
thieu sang » chieu sang, thieu khang, hieu lang
trang vat » trang vai, tang vat, trang mat
dung cong » dung trong
trang va » tran van, hang va
cong tai » cong thai, cong tac, dong tai
tai phan » tai thanh, tai phong, tai ngan

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)) - canh ((trang vat) or (trang va)) dung cong tai phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (thieu quang)) - canh ((trang vat) OR (trang va)) dung cong tai phan tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) OR (thieu quang)) - canh ((trang vat) or (trang va)) dung cong tai phan tu".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) OR (thieu quang)) - canh ((trang vat) or (trang va)) dung cong tai phan tu*.