Perhaps you should try some spelling variations:
thien van » thi van
thu sach » tu sach, thuat sach, thuoc sach
qua ban » qua quan
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
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: thu sach ((y nang) or (v nang)) x ho. thien van nam ((qua ban) or (cua ban)) hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((y nang) OR (v nang)) x ho. thien van nam ((qua ban) OR (cua ban)) hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ((y nang) or (v nang)) x ho. thien van nam ((qua ban) or (cua ban)) hanh di cua tre*.