Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu sach » thien hach, hieu cach, theo sach
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, thong cong, hang cong
cang thang » cong thanh, dang thanh
tong cong » trong cong, cong cong, dung cong
thang cau » hang cau, thong cau, thanh chau
trung va » truong va, trang va, trung ha

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

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