Perhaps you should try some spelling variations:
thieu khang » chieu khong, thieu quang
nhung tuong » nhung huong, nhung phuong, hung vuong
thieu sang » chieu sang, thieu quang, hieu lang
trung vap » trung cap, trung van, trung lap
tuong van » truong van, trong van, duong van
van thanh » ban thanh, van tuan
thanh cap » thanh lap, hanh cap, than cap
trung va » truong va, trang va, trung ha

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