Perhaps you should try some spelling variations:
cang thang » cong thanh, dang thanh
hoa chinh » hoan chinh, hoa hinh, hoc chinh
hoc kinh » hoc sinh, luoc kinh
van dung » van dong, xay dung, tin dung
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cao » toan cao, thai cao, than cap
va dung » va duong, vat dung, va ung

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc kinh) or (hoa chinh)) sach - cang thang ((va dung) OR (van dung)) cong dan than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc kinh) OR (hoa chinh)) sach - cang thang ((va dung) OR (van dung)) cong dan than cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc kinh) or (hoa chinh)) sach - cang thang ((va dung) OR (van dung)) cong dan than cao".
• Adding a wildcard symbol may retrieve word variants: ((hoc kinh) or (hoa chinh)) sach - cang thang ((va dung) OR (van dung)) cong dan than cao*.