Perhaps you should try some spelling variations:
thanh trung » thanh tung
nhung cong » dung cong, hang cong, nhung don
thong cong » trong cong, tong cong, thong thong
tieu sach » chieu sach, dien sach, te sach
trung cao » truong cao, trung cap, trung co
dan chan » dan gian, dan ca, van chat
chan lap » phan lap, thanh lap, dan lap

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu sach - thanh trung cao ((nhung cong) or (thong cong)) dan chan lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - thanh trung cao ((nhung cong) OR (thong cong)) dan chan lap.
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - thanh trung cao ((nhung cong) or (thong cong)) dan chan lap*.