Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
nam thuc » nam thuoc, am thuc, nam thu
vu sach » su sach
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, cua triet
va nam » van nam, ha nam, va nay
di cua » dai cua, doi cua, de 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 sach) OR (vu bach))) or (vu khach)) ky nang x hoi. hieu va nam thuc va hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((vu sach) OR (vu bach))) OR (vu khach)) ky nang x hoi. hieu va nam thuc va hanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((vu sach) OR (vu bach))) or (vu khach)) ky nang x hoi. hieu va nam thuc va hanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: ((((vu sach) OR (vu bach))) or (vu khach)) ky nang x hoi. hieu va nam thuc va hanh di cua tre*.