Perhaps you should try some spelling variations:
dung thuong » dung trong, hang thuong, cong thuong
chieu sang » chieu sach, chieu xanh, nhieu tang
dung chung » dung cong, dung ung, dung trung
hieu lang » hieu quang, nhieu tang, hieu van
anh trong » anh thuong, dinh trong, lang trong
trong van » trong cac
manh toan » thanh toan, anh tuan, tinh toan
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chieu sang) OR (hieu lang)) - anh trong van ((dung thuong) or (dung chung)) manh toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sang) OR (hieu lang)) - anh trong van ((dung thuong) OR (dung chung)) manh toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sang) OR (hieu lang)) - anh trong van ((dung thuong) or (dung chung)) manh toan cao".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sang) OR (hieu lang)) - anh trong van ((dung thuong) or (dung chung)) manh toan cao*.