Perhaps you should try some spelling variations:
thanh thuong » thanh huong, thanh chuong, thanh phuong
nhung huong » nhung phuong, nhung tuong, nhung cong
theo sach » thuoc sach, te sach, theo lich
hieu lang » chieu sang, hieu quang, nhieu tang
thuong va » truong va, thong va, thuong mai
chan cau » can cau, chinh cau, nhanh cau
phan cau » phan dau, phan cac, phan tu

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

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