Perhaps you should try some spelling variations:
thanh trung » thanh tung
nhung huong » nhung phuong, nhung cong, nhung dung
nhung tuong » nhung phuong, hung vuong, nhung cong
theo sach » thuoc sach, te sach, theo lich
hieu lang » chieu sang, hieu quang, nhieu tang
trung cho » trang cho, trong cho, trung co
dan chan » dan gian, dan ca, van chat
chan cau » phan cau, can cau, chinh cau

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