Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
chieu sang » chieu sach, chieu xanh, hieu lang
thien anh » thien danh, tien anh, thien thanh
tranh cua » doanh cua, manh cua
dung cong » dung trong
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: hoc ((thien anh) or (chieu sang)) - canh tranh cua ((nhung cong) OR (dung cong)) manh toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien anh) OR (chieu sang)) - canh tranh cua ((nhung cong) OR (dung cong)) manh toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien anh) or (chieu sang)) - canh tranh cua ((nhung cong) OR (dung cong)) manh toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((thien anh) or (chieu sang)) - canh tranh cua ((nhung cong) OR (dung cong)) manh toan cao*.