Perhaps you should try some spelling variations:
thieu khang » chieu khong
thieu quang » hieu quang, thien quan, trien quang
nhung cong » thong cong, hang cong, nhung don
khang chan » khang chien, quang chan
manh tran » manh toan, manh tuan, canh tranh
tran tuan » tran xuan, tran quang, tran thanh
dung cong » dung trong
van khang » van khanh, van thanh, van quang

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