Perhaps you should try some spelling variations:
vu khach » vu khanh, vay khach, cua khach
hanh vai » hanh vi, hanh va, hanh tai
ban hanh » ban hang
thuc ban » thuoc ban, thuc dan, thu ban
cam thuc » am thuc, nam thuc, cam thu
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
te sach » toc sach
vu khac » vu kham, vu khanh, bui khac
nang o » nang co, nang ho, nang ro
va cam » va cham, va cac, va cao
o hoi » co hoi, o hoc, o hai

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 (vu khac))) or (te sach)) ky nang o hoi. lieu va cam thuc ban hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((vu khach) OR (vu khac))) OR (te sach)) ky nang o hoi. lieu va cam thuc ban hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((((vu khach) or (vu khac))) or (te sach)) ky nang o hoi. lieu va cam thuc ban hanh vai cua tre*.