Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
xanh di » vanh dai, xanh tai
danh di » danh du, danh dien, danh gia
xuc ban » duc ban, cuc ban, quoc ban
sach ty » sach y, sach tu, sach thu
qua cam » qua cham, qua cac, qua ca
tang ma » mang may, tang van
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: thu sach ty ((nang x) or (tang ma)) hoi. hieu qua cam xuc ban ((danh di) or (xanh di)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty ((nang x) OR (tang ma)) hoi. hieu qua cam xuc ban ((danh di) OR (xanh di)) cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ty ((nang x) or (tang ma)) hoi. hieu qua cam xuc ban ((danh di) or (xanh di)) cua tre*.