Perhaps you should try some spelling variations:
thien van » thi van
su sach » so sach, vu sach
van dau » van dao, phan dau
dau tuc » dau tu, dao tuc, cau truc
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
y hang » ly hang, ty hang, yu hang
co hoi » co loi
tuc va » thuc va, truc va, tuc xa
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 ((co hoi) or (co hoc)). thien van dau tuc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y hang ((co hoi) OR (co hoc)). thien van dau tuc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach y hang ((co hoi) or (co hoc)). thien van dau tuc va hanh vi cua tre*.