Perhaps you should try some spelling variations:
thieu khang » chieu khong, thieu quang
thanh trung » thanh tung
hoc thieu » toc thieu, hoc hien
trung va » truong va, trang va, trung ha
cong tan » cong thanh, cong ty, cong ha
cong tac » cong ty
toan cao » toan ban, toan tap

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