Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
thien hach » thien thanh, hien hanh
tang quang » dang quang, tang quan, hang quang
quang dong » quang dung, quan dong, quang cuong
dong huong » dong thuong, dong duong, cong huong
hanh tang » hanh trang, anh tang, hanh mang
toan cau » toan ban, toan tap, toan tai
toan cao » toan ban, toan tap

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) or (thien hach)) - hanh tang quang dong huong dan ((toan cau) OR (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (thien hach)) - hanh tang quang dong huong dan ((toan cau) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) or (thien hach)) - hanh tang quang dong huong dan ((toan cau) OR (toan cao))".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (thien hach)) - hanh tang quang dong huong dan ((toan cau) OR (toan cao))*.