Perhaps you should try some spelling variations:
thieu khang » chieu khong, thieu quang
thanh trung » thanh tung
thieu sang » chieu sang, thieu quang, hieu lang
trung mon » trung son, trung moi, trung mot
mon nhung » hon nhung, song nhung, hong nhung
tuong ban » tuong bang, trong ban, tuong quan
tuong dan » huong dan, tung dan, xuong dan
than cap » khan cap, thanh lap, thanh cac

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