Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hoc chinh » hoan chinh, hoc sinh, hoc kinh
canh sinh » canh binh, tinh sinh, dang sinh
canh tinh » hanh tinh, manh tinh, canh tranh
vat nhung » va nhung, vap nhung, vai nhung
chinh cau » chinh chau, chinh ca, chinh can
cong dan » cong san, cong tan, huong dan
chan cau » phan cau, can cau, nhanh cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc chinh sach - ((canh sinh) or (canh tinh)) vat nhung cong dan ((chan cau) OR (chinh cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chinh sach - ((canh sinh) OR (canh tinh)) vat nhung cong dan ((chan cau) OR (chinh cau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chinh sach - ((canh sinh) or (canh tinh)) vat nhung cong dan ((chan cau) OR (chinh cau))".
• Adding a wildcard symbol may retrieve word variants: hoc chinh sach - ((canh sinh) or (canh tinh)) vat nhung cong dan ((chan cau) OR (chinh cau))*.