Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cham cua » chat cua, cham cuu, ham cua
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
cuu tre » cua tre, cau tren, cau treo
anh vi » hanh vi, anh ve, anh vu
anh va » hanh va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (toc sach)) ky lang xa hoi. hieu ve cham cua ban ((anh vi) or (anh va)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky lang xa hoi. hieu ve cham cua ban ((anh vi) OR (anh va)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ky lang xa hoi. hieu ve cham cua ban ((anh vi) or (anh va)) cuu tre*.