Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
xanh di » danh di, vanh dai, xanh tai
banh di » danh di, banh chi, vanh dai
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 ((banh 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 ((banh di) OR (xanh di)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty ((nang x) or (tang ma)) hoi. hieu qua cam xuc ban ((banh 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 ((banh di) OR (xanh di)) cua tre*.