Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thanh va » thanh van, hanh va, thanh ha
va thanh » gia thanh, ban thanh, va tinh
ve cham » va cham, ve chat, vu cham
cua tre » cua te, cuu tre, cua triet
tu sach » thu sach, su sach, te sach
ve cam » ve cac, va cam, ve cai
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: ((toc sach) or (tu sach)) ky nang x hoi. hieu ((ve cam) or (ve cham)) luc va thanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (tu sach)) ky nang x hoi. hieu ((ve cam) OR (ve cham)) luc va thanh va cua tre.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (tu sach)) ky nang x hoi. hieu ((ve cam) or (ve cham)) luc va thanh va cua tre*.