Perhaps you should try some spelling variations:
hang cay » hang ca, hang cau, hang cac
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, van anh, van ban
ban hanh » ban hang
te sach » toc sach
cay cho » cap cho, cao cho, cay co
van cau » van dau, van hau, van chat
cua tre » cua te, cuu tre, cua triet
y hang » ly hang, ty hang, yu hang
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: te sach y hang cay cho. hieu van cau truc ((van hanh) or (ban hanh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y hang cay cho. hieu van cau truc ((van hanh) OR (ban hanh)) vi cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach y hang cay cho. hieu van cau truc ((van hanh) or (ban hanh)) vi cua tre*.