Perhaps you should try some spelling variations:
thien van » thi van
vat hanh » vat thanh, va hanh, nhat hanh
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
van am » van nam, van lam, van dam
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho
thuc » thu

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 y nang x hoi. thien van am thuc ((vat hanh) or (van hanh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x hoi. thien van am thuc ((vat hanh) OR (van hanh)) vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. thien van am thuc ((vat hanh) or (van hanh)) vi cua tre*.