Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
thuc ban » thuoc ban, thuc dan, thu ban
hanh dao » lanh dao, thanh dat, thanh dam
hanh dai » hanh tai, vanh dai, thanh dat
nam thuc » nam thuoc, am thuc, nam thu
nang xa » nang x, lang xa, nang ma
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
va nam » van nam, ha nam, va nay

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 xa hoi. lieu va nam thuc ban ((hanh dai) OR (hanh dao)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu khach) OR (te sach)) ky nang xa hoi. lieu va nam thuc ban ((hanh dai) OR (hanh dao)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu khach) or (te sach)) ky nang xa hoi. lieu va nam thuc ban ((hanh dai) OR (hanh dao)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((vu khach) or (te sach)) ky nang xa hoi. lieu va nam thuc ban ((hanh dai) OR (hanh dao)) cua tre*.