Perhaps you should try some spelling variations:
sinh thai » dinh thi
sach thu » sach thue, sach thieu, sach tham
cham duc » pham duc, cham soc, pham duy
thai cua » than cua, tai cuc, tri cua
sach tu » cach tu, sach ty, sach uu
hang xa » hoang xa, hang va, hang ca
hieu va » lieu va, hieu qua
va cham » va chat, va tham
va sinh » va kinh, va tinh, vi sinh
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach tu) OR (sach thu)) hang xa hoi. hieu va cham duc va sinh thai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach tu) OR (sach thu)) hang xa hoi. hieu va cham duc va sinh thai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach tu) OR (sach thu)) hang xa hoi. hieu va cham duc va sinh thai cua tre*.