Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
nhung cong » dung cong, thong cong, hang cong
hien hanh » dieu hanh
hanh mang » nhanh mang, hanh trang, nhanh lang
dan toan » van toan, dan than, manh toan
van tuan » van quan, van ban, anh tuan
mang va » mang vua, hang va, bang 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 ((hien hanh) or (chieu sang)) - hanh mang va nhung cong ((dan toan) or (van tuan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien hanh) OR (chieu sang)) - hanh mang va nhung cong ((dan toan) OR (van tuan)) cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien hanh) or (chieu sang)) - hanh mang va nhung cong ((dan toan) or (van tuan)) cau*.