Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
nhung cong » dung cong, thong cong, hang cong
hoc thieu » toc thieu, hoc hien
trinh va » trinh van, trinh vat, trinh vi
trinh ve » trinh he, trinh vi, trinh viet
dan toan » van toan, manh toan, xuan toan
dan than » dan chan, ban than, van than

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 - canh ((trinh va) OR (trinh ve)) nhung cong ((dan toan) or (dan than)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - canh ((trinh va) OR (trinh ve)) nhung cong ((dan toan) OR (dan than)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sang - canh ((trinh va) OR (trinh ve)) nhung cong ((dan toan) or (dan than)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - canh ((trinh va) OR (trinh ve)) nhung cong ((dan toan) or (dan than)) cau*.