Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sach ty » sach y, sach tu, sach thu
sang ma » tang ma, nang ma, sang tao
hieu ve » hieu va, hieu van
xuc ban » duc ban, cuc ban, quoc ban
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
anh vi » anh va, anh ve, anh vu

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 ((sang ma) or (van xay)) hoi. hieu ve cam xuc ban ((anh vi) OR (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty ((sang ma) OR (van xay)) hoi. hieu ve cam xuc ban ((anh vi) OR (hanh vi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty ((sang ma) or (van xay)) hoi. hieu ve cam xuc ban ((anh vi) OR (hanh vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ty ((sang ma) or (van xay)) hoi. hieu ve cam xuc ban ((anh vi) OR (hanh vi)) cua tre*.