Perhaps you should try some spelling variations:
thien van » thi van
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
hanh di » hanh vi, hanh de, hang di
nam mua » nam cua, nam xua, nam luat
nam qua » nam quan, nam cua, nam xua
cua tre » cua te, cuu tre, cua triet
ly nang » ky nang, ly hang, ly vang
y nang » ky nang, v nang, may nang
di cua » dai cua, doi cua, de cua
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (ly nang)) x hoi. thien van ((nam qua) OR (nam mua)) van hanh di cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) OR (ly nang)) x hoi. thien van ((nam qua) or (nam mua)) van hanh di cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) OR (ly nang)) x hoi. thien van ((nam qua) or (nam mua)) van hanh di cua tre*.