Perhaps you should try some spelling variations:
nhung huong » nhung phuong, nhung tuong, nhung cong
chieu sach » chinh sach, chieu sang, chieu xanh
trung lap » trung cap, truong lam, truong lop
trung dam » trung tam, trung dai, trong dam
dan khan » dan khanh, dan chan, dan than
khan cap » khan ap, than cap, khoan cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chieu sach) OR (chiet tach)) - thanh ((trung lap) or (trung dam)) nhung huong dan khan cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sach) OR (chiet tach)) - thanh ((trung lap) OR (trung dam)) nhung huong dan khan cap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sach) OR (chiet tach)) - thanh ((trung lap) or (trung dam)) nhung huong dan khan cap".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sach) OR (chiet tach)) - thanh ((trung lap) or (trung dam)) nhung huong dan khan cap*.