Perhaps you should try some spelling variations:
hanh truong » hanh trong, anh truong, manh truong
thieu sang » chieu sang, thieu khang, thieu quang
hoc thieu » toc thieu, hoc hien
quan toan » quang toan, xuan toan, quan hoang
quan doan » quan hoang, chuan doan, chan doan
cao ung » cao dung, cac ung, bao ung
cho ung » cho nhung, cho cong, cho hang

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 - hanh truong ((cao ung) OR (cho ung)) trong ((quan toan) or (quan doan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - hanh truong ((cao ung) OR (cho ung)) trong ((quan toan) OR (quan doan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sang - hanh truong ((cao ung) OR (cho ung)) trong ((quan toan) or (quan doan)) cao".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - hanh truong ((cao ung) OR (cho ung)) trong ((quan toan) or (quan doan)) cao*.