Perhaps you should try some spelling variations:
cao thuoc » cay thuoc, cua thuoc, nam thuoc
cao thuc » bao thuc, can thuc, cao thu
hanh vai » hanh vi, hanh va, hanh tai
te sach » toc sach
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
ly nang » ky nang, ly hang, ly vang
y nang » ky nang, v nang, may nang

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 ((y nang) OR (ly nang)) xa hoi. hieu va ((cao thuc) or (cao thuoc)) va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y nang) OR (ly nang)) xa hoi. hieu va ((cao thuc) OR (cao thuoc)) va hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y nang) OR (ly nang)) xa hoi. hieu va ((cao thuc) or (cao thuoc)) va hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((y nang) OR (ly nang)) xa hoi. hieu va ((cao thuc) or (cao thuoc)) va hanh vai cua tre*.