Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
sinh trong » sinh truong, sinh trung, dinh trong
cac thang » bac thang, cac thong, cau thang
cac thanh » bac thanh, ban thanh, cuu thanh
ho chieu » theo chieu, hoc thieu, mot chieu
long dan » long doan, cong dan, nong dan
dan than » dan chan, ban than, van than
than tap » toan tap, han tap, phan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chieu sach - sinh trong ((cac thang) or (cac thanh)) long dan than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - sinh trong ((cac thang) OR (cac thanh)) long dan than tap*.