Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
chieu sang » chieu sach, chieu xanh, hieu lang
hieu manh » chieu xanh, hieu nganh, dieu hanh
hanh phan » thanh phan, anh phan, hanh han
cong manh » cong danh, duong manh, cong thanh
toan cau » toan cao, toan tap, toan tai
toan ban » van ban
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 manh ((toan cau) OR (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (hieu manh)) - hanh phan va nhung cong manh ((toan cau) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) or (hieu manh)) - hanh phan va nhung cong manh ((toan cau) OR (toan ban))".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (hieu manh)) - hanh phan va nhung cong manh ((toan cau) OR (toan ban))*.