Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
chieu sang » chieu sach, chieu xanh, hieu lang
hoc chieu » hoc thieu, ho chieu, hoc hien
hanh hang » thanh hang, hang hang, hanh mang
cong danh » cuong danh, cong dan, cong thanh
quang cao » nang cao, quang nam
hanh han » hanh nhan, hanh phan, hanh san
quan cau » toan cau, quan ha, quan cua

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 - ((hanh hang) or (hanh han)) va nhung cong danh ((quan cau) OR (quang cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu sang - ((hanh hang) OR (hanh han)) va nhung cong danh ((quan cau) OR (quang cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chieu sang - ((hanh hang) or (hanh han)) va nhung cong danh ((quan cau) OR (quang cao))".
• Adding a wildcard symbol may retrieve word variants: hoc chieu sang - ((hanh hang) or (hanh han)) va nhung cong danh ((quan cau) OR (quang cao))*.