Perhaps you should try some spelling variations:
thanh tung » thanh cong
doi chieu » doc hieu, doi chi, mot chieu
dung cong » dung trong
dong tham » dong tam, dong thap, dong thanh
hong tham » chong tham, hong thai, hoang thai
ho chieu » theo chieu, hoc thieu, mot chieu
tung va » trung va, tuong va, dung va
va dung » van dung, va duong, vat dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) or (doi chieu)) sach - thanh tung va dung cong ((dong tham) OR (hong tham)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (doi chieu)) sach - thanh tung va dung cong ((dong tham) OR (hong tham)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (doi chieu)) sach - thanh tung va dung cong ((dong tham) OR (hong tham)) cau".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (doi chieu)) sach - thanh tung va dung cong ((dong tham) OR (hong tham)) cau*.