Perhaps you should try some spelling variations:
thien van » thi van
hai thuc » thai thuc, dai thuc, ha thuc
hanh vai » hanh vi, hanh va, hanh tai
tu cach » tu cac
su sach » so sach, vu sach
cao hoi » cau hoi, co hoi, cao hoc
van hai » van ha, van chat, van hanh
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (su sach)) ky nang cao hoi. thien van hai thuc va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (su sach)) ky nang cao hoi. thien van hai thuc va hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (su sach)) ky nang cao hoi. thien van hai thuc va hanh vai cua tre*.