Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thu sach » thuat sach, thuoc sach, thu hoach
hieu ve » hieu va, hieu van
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
cam luc » cam xuc, cau luc
tu sach » su sach, te sach, tu cach
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
luc va » duc va, tuc va, loc va
va cua » va chua, via cua, ca cua
x hoi » xa hoi, o hoi, x ho

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))) or (thu sach)) ky nang x hoi. hieu ve cam luc va hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((tu sach) OR (toc sach))) OR (thu sach)) ky nang x hoi. hieu ve cam luc va hanh va cua tre.
• Adding a wildcard symbol may retrieve word variants: ((((tu sach) or (toc sach))) or (thu sach)) ky nang x hoi. hieu ve cam luc va hanh va cua tre*.