Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu sach » chieu sach, hieu cach, theo sach
thien hach » thien thanh, hien hanh
dung cong » dung trong
trung va » truong va, trang va, trung ha
cong dan » cong san, cong tan, huong dan
than cau » toan cau, phan cau, than cap
toan tap » toan ban
va dung » van dung, va duong, vat dung

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 (thien hach)) - thanh trung va dung cong dan ((than cau) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (thien hach)) - thanh trung va dung cong dan ((than cau) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sach) OR (thien hach)) - thanh trung va dung cong dan ((than cau) or (toan tap))".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) OR (thien hach)) - thanh trung va dung cong dan ((than cau) or (toan tap))*.