Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu van » hieu va, thien van, lieu va
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
lam xuc » cam xuc, lam duoc
van lam » van nam
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, me hoi
xuc va » duc va, tuc va, luc va
vi cua » vai cua, di cua

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

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