Perhaps you should try some spelling variations:
thien van » thi van
nam thuc » nam thuoc, am thuc, nam thu
thuc van » thuc vat, thuc dan, thuc va
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
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: su sach y nang x ho. ((hieu va) or (thien van)) nam thuc van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang x ho. ((hieu va) OR (thien van)) nam thuc van hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach y nang x ho. ((hieu va) or (thien van)) nam thuc van hanh vi cua tre*.