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 tac, cong thanh, cong ty
cong san » cong tac
toan tap » toan ban

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 san)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu khang - thanh trung va nhung ((cong tan) OR (cong san)) toan tap.
• Adding a wildcard symbol may retrieve word variants: hoc thieu khang - thanh trung va nhung ((cong tan) or (cong san)) toan tap*.