Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
sach thu » sach thue, sach thieu, sach tham
buoc van » buoc ban, buoc vao, luoc van
nam buoc » nam duoc, nam quoc, nam thuoc
hieu van » hieu va, thien van, lieu va
hanh di » hanh vi, hanh de, hang di
nang ma » tang ma, sang ma, nang cao
sach uu » sach luu, sach tu, sach xu
nang xa » nang x, lang xa, mang xa
cua tre » cua te, cuu tre, cua triet
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: tu ((sach uu) or (sach thu)) ((nang xa) or (nang ma)) hoi. hieu van nam buoc van hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach uu) OR (sach thu)) ((nang xa) OR (nang ma)) hoi. hieu van nam buoc van hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach uu) or (sach thu)) ((nang xa) or (nang ma)) hoi. hieu van nam buoc van hanh di cua tre*.