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
nuoc nhung » quoc hung, hoc nhung, nuoc vung
nhung cong » dung cong, thong cong, hang cong
cong dan » cong san, cong tan, huong dan
toan cao » toan ban
toan tap » toan 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 dan ((toan cao) OR (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (hieu ca)) - thanh trung nuoc nhung cong dan ((toan cao) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sach) or (hieu ca)) - thanh trung nuoc nhung cong dan ((toan cao) OR (toan tap))".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) or (hieu ca)) - thanh trung nuoc nhung cong dan ((toan cao) OR (toan tap))*.