Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu sach » chieu sach, thien hach, hieu cach
trung nuoc » truong nuoc, trung quoc, trong nuoc
nhung cong » dung cong, hang cong, nhung don
thong cong » trong cong, tong cong, thong thong
dan toan » van toan, dan than, manh toan
toan ban » van ban
hieu ca » hieu cac, hieu cua, hieu 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 ca)) - thanh trung nuoc ((nhung cong) OR (thong cong)) dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (hieu ca)) - thanh trung nuoc ((nhung cong) OR (thong cong)) dan toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sach) or (hieu ca)) - thanh trung nuoc ((nhung cong) OR (thong cong)) dan toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) or (hieu ca)) - thanh trung nuoc ((nhung cong) OR (thong cong)) dan toan ban*.