Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
nam thuc » nam thuoc, am thuc, nam thu
thuc van » thuc vat, thuc dan, thuc va
van hanh » van thanh, ban hanh, van anh
vu sach » vu bach, su sach
bo sach » co sach, hoc sach
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ve nam » he nam, va nam, le nam
vi cua » vai cua, di cua

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 (bo sach))) or (vu khach)) ky nang x ho. hieu ve nam thuc van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((vu sach) OR (bo sach))) OR (vu khach)) ky nang x ho. hieu ve nam thuc van hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((((vu sach) or (bo sach))) or (vu khach)) ky nang x ho. hieu ve nam thuc van hanh vi cua tre*.