Perhaps you should try some spelling variations:
thien van » thi van
thi hanh » thi thanh
van hanh » van thanh, ban hanh, van anh
duoc van » duoc va, duc van, duoc ban
nam duoc » nam thuoc, da duoc, dat duoc
te sach » toc sach
hanh va » hang va, hanh vi
cua tre » cua te, cuu tre, cua triet
tay hoi » tay ho, 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

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. ((thien van) or (thi hanh)) nam 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. ((thien van) OR (thi hanh)) nam duoc van hanh va cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ((ty dong) or (ky dang)) tay hoi. ((thien van) or (thi hanh)) nam duoc van hanh va cua tre*.