Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, theo sach
thanh tung » thanh cong
nhung cong » thong cong, hang cong, nhung don
cang thang » cong thanh, dang thanh
hieu cach » hieu cac, chieu sach, hieu ca
dung cong » dung trong
thang cau » hang cau, thong cau, thanh chau
tung va » trung va, tuong va, dung va

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 (hieu cach)) - thanh tung va ((nhung cong) or (dung cong)) cang thang cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (hieu cach)) - thanh tung va ((nhung cong) OR (dung cong)) cang thang cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sach) OR (hieu cach)) - thanh tung va ((nhung cong) or (dung cong)) cang thang cau*".