Perhaps you should try some spelling variations:
dam thuc » am thuc, dan thuc, nam thuc
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty nang ((xa hoi) or (o hoi)). hieu ve ((dam thuc) or (cam xuc)) va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang ((xa hoi) OR (o hoi)). hieu ve ((dam thuc) OR (cam xuc)) va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ty nang ((xa hoi) or (o hoi)). hieu ve ((dam thuc) or (cam xuc)) va hanh vi cua tre*.