Perhaps you should try some spelling variations:
thien van » thi van
van hanh » van thanh, ban hanh, van anh
duoc van » duoc va, duc van, duoc ban
lam duoc » nam duoc, luat duoc, lam thuoc
te sach » toc sach
hanh va » hang va, hanh vi
van lam » van nam
cua tre » cua te, cuu tre, cua triet
tay hoi » tao hoi, tay thai
ky dang » ky nang, ky danh
ty dong » tay dong, tu dong, ly dong
va cua » va chua, via cua, ca cua
tay ho » tay co, tay o, tay khao

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((ty dong) or (ky dang)) ((tay hoi) OR (tay ho)). thien van lam duoc van hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ty dong) OR (ky dang)) ((tay hoi) OR (tay ho)). thien van lam duoc van hanh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ty dong) or (ky dang)) ((tay hoi) OR (tay ho)). thien van lam duoc van hanh va cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((ty dong) or (ky dang)) ((tay hoi) OR (tay ho)). thien van lam duoc van hanh va cua tre*.