Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
tinh voi » trinh voi, tinh doi, binh voi
tu sach » thu sach, su sach, te sach
cam cua » ca cua, nam cua, cau cua
dinh vi » dinh ve, dinh viet, dinh tri
cuu tre » cua tre, cau tren, cau treo
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
ve cam » ve cham, ve cac, va cam

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) or (toc sach)) ky lang xa hoi. hieu ve cam cua ban ((dinh vi) or (tinh voi)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (toc sach)) ky lang xa hoi. hieu ve cam cua ban ((dinh vi) OR (tinh voi)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (toc sach)) ky lang xa hoi. hieu ve cam cua ban ((dinh vi) or (tinh voi)) cuu tre*.