Perhaps you should try some spelling variations:
nhung cong » dung cong, hang cong, nhung don
chieu sang » chieu sach, chieu xanh, hieu lang
thong cong » trong cong, tong cong, thong thong
hieu manh » chieu xanh, hieu nganh, dieu hanh
hanh phan » thanh phan, anh phan, hanh han
manh toan » thanh toan, anh tuan, tinh toan
toan cau » toan cao, toan ban, toan tap
phan va » phan van, nhan va, han va

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sang) or (hieu manh)) - hanh phan va ((nhung cong) OR (thong cong)) manh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (hieu manh)) - hanh phan va ((nhung cong) OR (thong cong)) manh toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) or (hieu manh)) - hanh phan va ((nhung cong) OR (thong cong)) manh toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (hieu manh)) - hanh phan va ((nhung cong) OR (thong cong)) manh toan cau*.