Perhaps you should try some spelling variations:
thieu quang » thien quan, trien quang, hieu quan
hieu quang » hieu quan, hieu qua, diep quang
thanh tung » thanh cong
cua trong » cua truong, cua trung, qua trong
cong tan » cong tac, cong san, cong thanh
tan than » tan thanh, tan tran, ban than
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 ((hieu quang) or (thieu quang)) - ((thanh trung) OR (thanh tung)) cua trong cong tan than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu quang) OR (thieu quang)) - ((thanh trung) OR (thanh tung)) cua trong cong tan than cap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu quang) or (thieu quang)) - ((thanh trung) OR (thanh tung)) cua trong cong tan than cap".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu quang) or (thieu quang)) - ((thanh trung) OR (thanh tung)) cua trong cong tan than cap*.