Perhaps you should try some spelling variations:
thanh trung » thanh tung
trung gian » truong giang, truong giao, trong giang
doan duong » doan cuong, doan huong, doan phuong
hoc thieu » toc thieu, hoc hien
dan duong » dan dung, van duong, dai duong
ho chieu » theo chieu, doi chieu, mot chieu
tan ran » tan tran, tan van, tan san
ran cau » van cau, ban cau, can cau

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 (hoc thieu)) sach - thanh trung gian ((dan duong) or (doan duong)) tan ran cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (hoc thieu)) sach - thanh trung gian ((dan duong) OR (doan duong)) tan ran cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) OR (hoc thieu)) sach - thanh trung gian ((dan duong) or (doan duong)) tan ran cau".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) OR (hoc thieu)) sach - thanh trung gian ((dan duong) or (doan duong)) tan ran cau*.