Perhaps you should try some spelling variations:
thanh truong » thanh trung, thanh thuong, thanh tung
thieu quang » hieu quang, thien quan, hieu quan
trien quang » tran quang, tuyen quang, dien quang
thieu sang » chieu sang, thieu khang, hieu lang
truong va » truong dai, truong cao, truong dao
hang cong » dang cong, hang nong, bang cong
cong tan » cong tac, cong san, cong thanh
tan than » tan thanh, tan tran, ban than
than cao » toan cao, thai cao, than cap
va hang » van hang, va nang, va lang

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