Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
chieu sang » chieu sach, chieu xanh, hieu lang
thong cong » trong cong, tong cong, thong thong
tranh va » tranh van, trang va, trinh va
va thong » va thuong, va phuong, he thong
van toan » van tan, van thanh, manh toan
van tuan » van quan, van ban, anh tuan

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

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