Perhaps you should try some spelling variations:
thanh trung » thanh tung
dung thuong » dung trong, hang thuong, dung thuoc
cong thuong » hang thuong
chieu sang » chieu xanh, hieu lang, nhieu tang
chieu sach » chinh sach, chiet tach, chieu xanh
trung cap » truong cao, trung tam
cap toan » tap toan, lap toan, phap toan
toan ban » van ban

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu sang) or (chieu sach)) - thanh trung cap ((dung thuong) OR (cong thuong)) cap toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sang) OR (chieu sach)) - thanh trung cap ((dung thuong) OR (cong thuong)) cap toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sang) or (chieu sach)) - thanh trung cap ((dung thuong) OR (cong thuong)) cap toan ban".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) or (chieu sach)) - thanh trung cap ((dung thuong) OR (cong thuong)) cap toan ban*.