Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hoc chieu » hoc thieu, ho chieu, hoc hien
dang cong » dung cong
cong lang » cong vang, cong luong, cong quang
thuat dam » thuat cam, thuat do, thuat xay
chat ban » nhat ban, chat ran, cua ban
cong su » cong suc, cong sua, cong cu
su dang » su 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 chieu sach - thanh cong su dang cong lang ((chat ban) or (thuat dam))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu sach - thanh cong su dang cong lang ((chat ban) OR (thuat dam)).
• Adding a wildcard symbol may retrieve word variants: hoc chieu sach - thanh cong su dang cong lang ((chat ban) or (thuat dam))*.