Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thu sach » tu sach, thuat sach, thu hoach
cham xuc » cam xuc, chat xuc, cham soc
hieu van » hieu va, thien van, lieu va
cao hoi » cau hoi, co hoi, cao hoc
hieu ve » hieu va
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
di cua » dai cua, doi cua, de cua
xuc va » duc va, tuc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) OR (thuoc sach)) ky nang cao hoi. ((hieu ve) or (hieu van)) cham xuc va hanh di cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuoc sach)) ky nang cao hoi. ((hieu ve) OR (hieu van)) cham xuc va hanh di cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (thuoc sach)) ky nang cao hoi. ((hieu ve) or (hieu van)) cham xuc va hanh di cua vat".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (thuoc sach)) ky nang cao hoi. ((hieu ve) or (hieu van)) cham xuc va hanh di cua vat*.