Perhaps you should try some spelling variations:
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
van cuu » van cau, van chu, van cua
su sach » so sach, vu sach
yu hang » yu zhang, yu pang, yu wang
cua tre » cua te, cuu tre, cua triet
co hoi » co hoc, co loi
y hang » ly hang, ty hang, _ hang
van cu » van cau, van chu, van cua
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 ((y hang) or (yu hang)) co hoi. thien ((van cuu) OR (van cu)) thuc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y hang) OR (yu hang)) co hoi. thien ((van cuu) OR (van cu)) thuc va hanh vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y hang) or (yu hang)) co hoi. thien ((van cuu) OR (van cu)) thuc va hanh vi cua tre*".