Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
hanh trinh » canh tranh, hanh chinh
trinh quan » tinh quang, trinh luat, trinh han
hoc thieu » toc thieu, hoc hien
nhung don » nhung van, nhung bo
dung cong » dung trong
manh toan » thanh toan, tinh toan

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 trinh quan ((nhung don) or (dung cong)) ((manh toan) or (anh tuan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - hanh trinh quan ((nhung don) OR (dung cong)) ((manh toan) OR (anh tuan)) cao.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - hanh trinh quan ((nhung don) or (dung cong)) ((manh toan) or (anh tuan)) cao*.