Perhaps you should try some spelling variations:
tam thuc » tham thuc, am thuc, nam thuc
thuc van » thuc vat, thuc dan, thuc va
hieu va » lieu va, hieu qua
hang di » hang doi, hang vi, hang dien
hanh di » hanh vi, hanh de, danh di
te sach » toc sach
ty nang » ky nang, ty xang, ty hang
hoc anh » hoc nganh, hoc nhanh, ngoc anh
cua tre » cua te, cuu tre, cua triet
va tam » van tam, va tham, va tac

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (hoc anh)) ty nang x ho. hieu va tam thuc van ((hanh di) OR (hang di)) cua tre~.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (hoc anh)) ty nang x ho. hieu va tam thuc van ((hanh di) or (hang di)) cua tre*.