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 phan » thanh phan, anh phan, hanh nhan
cong manh » cong danh, duong manh, cong thanh
hanh han » hanh nhan, hanh san, anh han

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