Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
tu sach » thu sach, su sach, te sach
hanh di » hanh vi, hanh de, hang di
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
lang ha » long ha
ky lang » ky nang, ky dang, ky tang
cua tre » cua te, cuu tre, cua triet
ha hoi » hoa hoi, ha noi, xa hoi
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
di cua » dai cua, doi cua, de cua

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 (thuoc sach)) ky lang ha hoi. hieu vu cham ((xuc va) or (luc va)) hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuoc sach)) ky lang ha hoi. hieu vu cham ((xuc va) OR (luc va)) hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuoc sach)) ky lang ha hoi. hieu vu cham ((xuc va) or (luc va)) hanh di cua tre*.