Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
doi chieu » doc hieu, doi chi, ho chieu
thong dan » thong van, tuong dan, thong den
trang ha » trang va, trung ha, tang ha
trinh ha » trinh han, trinh hoa, trinh nha
dan toan » van toan, dan than, manh toan
toan ban » van ban

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 - canh ((trang ha) or (trinh ha)) thong thong dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - canh ((trang ha) OR (trinh ha)) thong thong dan toan ban*.