Perhaps you should try some spelling variations:
nhung tuong » nhung huong, nhung phuong, hung vuong
hieu lang » chieu sang, hieu quang, nhieu tang
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
manh toan » thanh toan, tinh toan
hoc hieu » hoc thieu, hoc hien, doc hieu
dan toan » van toan, dan than, xuan toan
tinh va » tich va, trinh van, trinh vat

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu lang - hanh tinh va nhung tuong ((dan toan) or (((manh toan) OR (anh tuan)))) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - hanh tinh va nhung tuong ((dan toan) OR (((manh toan) OR (anh tuan)))) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu lang - hanh tinh va nhung tuong ((dan toan) or (((manh toan) OR (anh tuan)))) cau".
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - hanh tinh va nhung tuong ((dan toan) or (((manh toan) OR (anh tuan)))) cau*.