Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu sang » chieu sang, thieu khang, thieu quang
tuan nhung » tuan hung, thuat nhung, tranh nhung
quan nhung » qua nhung, cua nhung, luan chung
hoc thieu » toc thieu, hoc hien
cong manh » cong danh, duong manh, cong thanh
toan cao » toan ban, toan tap

You may be able to get more results by adjusting your search query.

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