Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
cam thuc » am thuc, nam thuc, cam thu
thuc ban » thuoc ban, thuc dan, thu ban
ban hanh » ban hang
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu khach) or (te sach)) ky nang x hoi. lieu va cam thuc ban hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu khach) OR (te sach)) ky nang x hoi. lieu va cam thuc ban hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((vu khach) or (te sach)) ky nang x hoi. lieu va cam thuc ban hanh vi cua tre*.