Perhaps you should try some spelling variations:
trang thuat » trang thuc, trang thiet, trang tuan
trong thuat » trong hoat, trong thu, trong phat
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
cong tan » cong tac, cong san, cong thanh
khan ap » khan cap, han ap, khan dam

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo chieu sach - thanh ((trang thuat) OR (trong thuat)) nhung ((cong dong) or (cong tan)) khan ap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - thanh ((trang thuat) OR (trong thuat)) nhung ((cong dong) OR (cong tan)) khan ap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sach - thanh ((trang thuat) OR (trong thuat)) nhung ((cong dong) or (cong tan)) khan ap".
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - thanh ((trang thuat) OR (trong thuat)) nhung ((cong dong) or (cong tan)) khan ap*.