Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
cham tuc » nham thuc, pham thuc, tham thuc
vu sach » vu bach, su sach
va hanh » van hanh, va thanh, va danh
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di cua
x hoi » xa hoi, x ho, 5 hoi
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 sach) or (vu khach)) ky nang ((x hoi) OR (o hoi)). hieu ve cham tuc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu khach)) ky nang ((x hoi) OR (o hoi)). hieu ve cham tuc va hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (vu khach)) ky nang ((x hoi) OR (o hoi)). hieu ve cham tuc va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (vu khach)) ky nang ((x hoi) OR (o hoi)). hieu ve cham tuc va hanh vi cua tre*.