Perhaps you should try some spelling variations:
thanh trung » thanh tung
nhung trung » chuong trung, dung trung, chong trung
theo chieu » theo tieu, ho chieu, theo chu
nhung dung » phuong dung, ung dung, thong dung
trung cua » truong cua, trung tuan, trung cap
theo yeu » theo tieu, thiet yeu, theo chu
dai khan » dai han, dai kham, dai khoang
khan ap » khan cap, han ap, khan dam

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo chieu) or (theo yeu)) sach - thanh trung cua ((nhung trung) OR (nhung dung)) dai khan ap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (theo yeu)) sach - thanh trung cua ((nhung trung) OR (nhung dung)) dai khan ap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) or (theo yeu)) sach - thanh trung cua ((nhung trung) OR (nhung dung)) dai khan ap".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (theo yeu)) sach - thanh trung cua ((nhung trung) OR (nhung dung)) dai khan ap*.