Perhaps you should try some spelling variations:
nam thuoc » nam thu, nha thuoc, cay thuoc
nam thuc » am thuc, nam thu, nam tu
hanh vai » hanh vi, hanh va, hanh tai
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cao hoi » cau hoi, co hoi, cao hoc
thi van » thi lan, thi hanh, thi nang
xa hanh » xa thanh, xa khanh, va hanh
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 sach ky nang cao hoi. ((thien van) OR (thi van)) ((nam thuc) or (nam thuoc)) xa hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang cao hoi. ((thien van) OR (thi van)) ((nam thuc) OR (nam thuoc)) xa hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang cao hoi. ((thien van) OR (thi van)) ((nam thuc) or (nam thuoc)) xa hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang cao hoi. ((thien van) OR (thi van)) ((nam thuc) or (nam thuoc)) xa hanh vai cua tre*.