Perhaps you should try some spelling variations:
thanh truong » thanh trung, thanh thuong, thanh tung
theo sach » thuoc sach, te sach, theo lich
hieu lang » chieu sang, hieu quang, nhieu tang
cao nhung » cho nhung, cao chung, co nhung
cam nhung » cam hung, nam nhung, tham nhung
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 truong ((cao nhung) OR (cam nhung)) huong dan chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((theo sach) OR (hieu lang)) - thanh truong ((cao nhung) OR (cam nhung)) huong dan chan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((theo sach) or (hieu lang)) - thanh truong ((cao nhung) OR (cam nhung)) huong dan chan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((theo sach) or (hieu lang)) - thanh truong ((cao nhung) OR (cam nhung)) huong dan chan cau*.