Perhaps you should try some spelling variations:
bach tuoc » sach duoc, sach nuoc
thanh vi » hanh vi, thanh va, thanh ve
xa thanh » va thanh, ha thanh, ta thanh
van bach » van bac, van hach, van sach
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
tuoc xa » tuc xa, duoc xa, uoc xa
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
so sanh » do sanh
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (so sanh)) vu ((nang xa) or (lang xa)) hoi. hieu van bach tuoc xa thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sanh)) vu ((nang xa) OR (lang xa)) hoi. hieu van bach tuoc xa thanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sanh)) vu ((nang xa) or (lang xa)) hoi. hieu van bach tuoc xa thanh vi cua tre*.