Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu van » hieu va, thien van, lieu va
van cam » van nam, van lam, van cau
cam tuc » cam xuc, cam tu, nam thuc
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
ma hoi » mai hoi, ma hoa, me hoi
tuc va » thuc va, truc va, tuc xa
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cac) or (thuoc sach)) ky nang ((ma hoi) or (xa hoi)). hieu van cam tuc va hanh di cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cac) OR (thuoc sach)) ky nang ((ma hoi) OR (xa hoi)). hieu van cam tuc va hanh di cua vat.
• Adding a wildcard symbol may retrieve word variants: ((tu cac) or (thuoc sach)) ky nang ((ma hoi) or (xa hoi)). hieu van cam tuc va hanh di cua vat*.