Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
cac thoi » cac toi, cac hop, cac tro
su sach » so sach, vu sach
va hanh » van hanh, va danh, ban hanh
van cac » van hac, van cau, van bac
nang xa » nang x, lang xa, nang ma
va nang » van nang, da nang, cam nang
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)) va nang xa hoi. hieu van cac thoi ((va hanh) or (va thanh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sanh)) va nang xa hoi. hieu van cac thoi ((va hanh) OR (va thanh)) vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sanh)) va nang xa hoi. hieu van cac thoi ((va hanh) or (va thanh)) vi cua tre*.