Perhaps you should try some spelling variations:
thieu khang » chieu khong, thieu quang
thieu sang » chieu sang, thieu quang, hieu lang
hoang van » hang va
cua dung » cua dang, qua dung, cua rung
cua dong » chua dong, cua cong, cua dang
van tuan » van quan, van ban, anh tuan
tuan cau » toan cau, quan cau, tuan cu

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) OR (thieu khang)) - canh tranh ((cua dung) OR (cua dong)) hoang van tuan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) OR (thieu khang)) - canh tranh ((cua dung) or (cua dong)) hoang van tuan cau~".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) OR (thieu khang)) - canh tranh ((cua dung) or (cua dong)) hoang van tuan cau*.